Once we have MAF integrated over time, we can calculate fuel flow using a specific air/fuel mixing ratio (A/F). The Stock MAF measured (as best as I could) was 75mm just before, at, and just after the MAF sensor it self. Symptoms Of A Bad MAP Sensor. As far as MAF look at your Air Flow Grams per sec (AFGS) on data logs it s/b smooth with no jerky jumping. Distributor Gear Applications-Important Reading. Compare your readings with those specified in your vehicle service manual. "Faking out" an oxygen sensor refers to the process of bypassing the sensor so that the sensor does not relay the correct information to the system's computer. As such, Chevrolet was prepared to commemorate its departure by offering two special edition Corvettes, both of which would feature an upgraded version of the LT1 power plant. Add to Wishlist. P0102 Trouble code definition. It builds on the technologies and capability of the LT1 6. Calibration: the engine at idle and remove the air cleaner or stick your hand in front of the airstream while watching the O2 readings. OBD-II Code P0113 is defined as a Intake Air Temperature Circuit High Input. The 1996 LT4 was a derivative of the LT1 that was introduced back in 1992. '94 LT1 Never-ending problem Caprice Car Forums. These head studs are manufactured by ARP from premium 8740 chrome moly steel and heat treated to 200,000 psi. Air is directed through a new air intake tube constructed of cross-linked, high-density polyethylene that is designed using extensive computer modeling to maintain proper mass air flow readings and calibration. The MAF will max out (reading range) at ~4000 RPMS and the fuel is added in the power enrichment map. Just a little video I made to show some people what the MAF porting on my 1995 Z28 383 stroker is. GM > Engine > Airflow > General Airflow. He mentions this in the TrainingPeaks pod if I’m right. Earls Performance. What's happening: When cold: seems to idle well enough and can push the pedal and get power that one should expect with this car. 5 mpg and slowly. You would test the ohm readings on certain wire connecting to the MAS. Alright first off thanks to everyone for the help diagnosing the drivability of my car. Trending Topics. 5-year $49. 5-13 and i plan on adusting it more but im also working on the cruise and idle mixxture. The MAP sensor on your 2. These head studs are manufactured by ARP from premium 8740 chrome moly steel and heat treated to 200,000 psi. This program will be you basis for where, when and how much to change on the VE table. Is the reason its coming up with this code bc of the volume of the air is not the normal. Erroneous idle air control (iac) valve operation. Mount Airy NC 27030-2545. common issues are frayed wires that cause bad readings. Port EFI designs (an individual injector for each cylinder) are referred to as dry flow. Vehicle: 2001 Land Rover Discover II Codes: P0171, P0174, TCM Incorrect Gear Ratio Symptoms: NONE, Slight pre-detonation (pinging) when hot STRAIGHT TO THE POINT: The vehicle has no drivability concerns and was hard to diagnosis. The new design incorporated sheet moulding compound (SMC) made from chopped fiberglass and polyester resin for the roof, hatch, doors. I pulled the SAFC and wired in the MAF-T. Cadillac Engine Discussion. FREE SHIPPING ON ORDERS OVER $50 TO THE CONTINENTAL US. 0L and LS7 engines and Pennzoil Heavy Duty 40W in all 6. 1986-92 TPI Vacuum Line Diagrams. Scanmaster Instructions Power Up On initial key-on, the right-most decimal point will flash quickly to indicate that data is 33 MAF sensor signal too high Bad Mass AirFlow sensor MAF AirFlow (MAF reading) 0-255 SP Spark advance 0-60 degrees btdc LP Injector Pulsewidth (left) 0-50 ms. * 02L ‑ Special not color charted secondary (lower) * 02U ‑ Special not color charted exterior. Ford has used MAF metering on '88 California 5. 5" maf and maf-t soon 'though. And as said above if the MAS is messed up the PCM will add/pull fuel to match the incorrect AFGS readings and your O2's will catch that and BLM's will jump around. installuniversity. Which ones? That is the red box with "DTC err". The engine oil life system calculates engine oil life based on vehicle use and displays the CHANGE ENGINE OIL SOON DIC message or Code 82 DIC message when it is necessary to change the engine oil and filter. 95 Black Face - $ 29. This information is used by the Electronic Controller Unit (ECU) to determine the amount of fuel needed to achieve the stoichiometric ratio consisting of 14. Ok so I've had some codes for a while (maf low input ,evap purge ,and o2 bank 1 ) so I logged it today and purge sempt to be responding appropriately along with everything else except the maf wouldn't budge it stuck at 0. This is a "MAF TRANSLATOR BOX AND A LS1 MASS AIR FLOW SENSOR" for a 1986 or 1987 Buick Grand National, T Type, Turbo T, or GNX 3. 3 Vortec for even more air flow. the stock lt1 maf will max out or start behaving strangely somewhere just above 450afgs as far as i know, but i've never taken it that high. MagnaFlow manufactures the best exhaust systems, mufflers, pipes and catalytic converters; now being sold directly from our website! We proudly manufacture products in the USA using premium components and the latest technology. Now, in case this is not the article you're looking for, there are also 3 other GM MAF sensor test articles: How To Test The GM Mass Air Flow Sensor: GMC Savana Van and Chevy Express Van 4. Looking over my recent scan, I'm running all over the place on my Short term fuel trims between -3 and +4. 95 Black Face Red Numbers - $ 29. The throttle position sensor is key to getting the desired power and fuel efficiency from your vehicle in any driving situation. 1992-1995 LT1 Trouble codes OBD I. You will see two bars that span the inner. OBD2 readings are always the actual readings from a component, OEM side readings may be substituted to keep the vehicle running so they can be misleading. 5" vice the 3" MAF on the Impala and the S10. IMHO, the F-body MAF won't be needed till you start adding better cam and heads ALONG with the bolt-ons. As such, Chevrolet was prepared to commemorate its departure by offering two special edition Corvettes, both of which would feature an upgraded version of the LT1 power plant. Volumetric Efficiency. This is a direct replacement AC Delco part that is guaranteed to keep your cars computer receiving accurate air/fuel ratio readings and your engine running at optimum efficiency. Get information on the latest cars, motorcycles and trucks with expert reviews, classic car auction, information on new and used car prices, restomods and regular auto shows coverage. Next, hold engine speed steady at about 2500 rpm for 15 seconds and read the gauge. Early LT1 systems were speed density with sequential control with knock control. MS3XV357 Hardware 1. 1992 to 1997 LT1 5. 5 before I did the reset. 2 to 6 is correct MAF reading for warmed up idle, remember it's calculated PCM looks at IAT and MAS (sensor frequency) to calculate the weight of the air in grams per/sec. It may be possible to use a 3. It gives off a low voltage output to the Engine Control Unit. The mass air flow. But will start right back up without spraying starter fuild in. Now the engine has warmed up to normal and the MAF is reading 0. The only differences are that the Corvette got 4-bolt mains, which has absolutely no affect on power output. Black smoke coming from the tail-pipe. This information is sent to the engine computer, which adjusts other variables such as the rate of. C4 Corvette Sensor Coolant Temperature P/N 25036708 : 185 Ohms @ 210F, 3400 Ohms @ 68F, 7,500 Ohms @ 39 F. The 2014 Chevrolet Cruze has 883 problems & defects reported by Cruze owners. This information is used by the Electronic Controller Unit (ECU) to determine the amount of fuel needed to achieve the stoichiometric ratio consisting of 14. A stock GM TPI MAF is only capable of flowing approximately 550-600 CFM @ 28 inches of H2O. Most C4 and newer Corvettes use a MAF sensor to determine how much air is being pulled into the intake manifold. The long term fuel trims (LTFT) are driven by the short term fuel trims. you still need the maf sensor because the iat1 sensor is integrated into it so unless your going to make a custom fitting to install a stand alone iat1 sensor somewhere and wire it in - just be easier to keep the maf but you can disable it with hptuners and run speed density only still but you need that iat1 for fueling calculations. LS7 / LS3 5 Wire MAF TO LS1 3 Wire Mass Air Flow Harness Adapter LSX LS Swap. 1 volts, or between 200 and 215 rpm. Even if the fuel pressure was off why is the Mass air flow sensor giving a reading parked at idle of ~4. Most Ford problems related to lean conditions are vacuum leaks and fuel supply. Hi guys, I'm still having little pops in my exhaust pipe, which i assume is either a rich or lean mixture problem. The mass air flow sensor itself impedes air flow slightly; Creates a slight time lag because of the small added distance the air has to travel to go through the mass air flow sensor. In 1996 the ecm numbers changes to either 16214399 or 16242921, this is the first true year of the OBD II systems. Another code will set if the TPS voltage is lower than the computer expects to see. Plug in the MAF, IAT and optispark vent. Lean and/or rich code(s). De-screening the MAF sensor. I bought our Trax in 2015 used from a GM dealer about 125 miles away from our home, it had about 17,000 miles on it. James and Thomas take the new 2019 Ford Mustang EcoBoost and pit it against the Chevrolet Camaro 1LT. A fully ported MAF will still only approach 750 CFM. 3 Jan 2004 Well, before i start to throw parts at it. Hot Idle MAF Readings. * 00L ‑ Only primer secondary (lower) exterior. There are three basic items necessary to tuning your own LT1 (or. The worst complaints are accessories - interior, steering, and lights problems. A Fellow LT1 Owner. This will be tailored to the LT1 engine, especially the '94-'95; the VE table tuning aspects will be even more helpful to '92-'93 and '96-'97 LT1s. 7) to derive the total mass of fuel that has. B/D Body (note uses smaller MAF too) LT1 Z28 LT1 Trans AM Ram Air Corvette. Black w/custom graphics on sides. I have a '95 Caprice LT1 that starts, idles for about 5 seconds, then shuts off. Also to note, usually small code readers will not pick up some codes in the engine control module. Most intakes will come with a Mass Air Flow spot, so you take your existing one out of the stock intake and connect it into your aftermarket intake in the same spot. 5" maf and maf-t soon 'though. This information is sent to the engine computer, which adjusts other variables such as the rate of. The 830HP pump gas 434 that could. AP replaced the original LT1 block with a 2-bolt version out of a police cruiser. These rims are imported from Australia and are all 19x8 in size with 41mm offset. Pressure sensors do not pose any restriction to the flow of air into the engine, unlike a MAF sensor. 100 PSI Liquid Filled Fuel Pressure Gauge 0-100 PSI WITH Adapter for LS engines /LT1 (92-97) and L98 (TPI) CHEVROLET CHEVY CORVETTE CAMARO $ 29. 5" LT1 MAF's use the same frequency range so our ECM can read the full range, although the air flow at the same frequency is different, of course. OBD2 readings are always the actual readings from a component, OEM side readings may be substituted to keep the vehicle running so they can be misleading. Throttle Learn Important: Do NOT perform this procedure if DTCs are set. It was reading 28. This way you can tune the SD to match the MAF reading. What does this code mean anyway? The definition for this this P0171 code is Fuel Trim System Lean (Bank 1). The remote MAF's from the 3400 (3") and the 3. Ok probably a dumb question. Trending Topics. i disconnected the MAF and i couldnt find anything with a good answer to the problem. 01-23-2011, 10:02 PM. Posted In Marketplace. this maf doesn't really know what pressure is. 595 115+4 cam , CNC LS3 heads, LS7 MAF, Kooks 2" primary tube headers, Corsa Tigershark exhaust, Hotchkis sway bars, Monster level 3 clutch, custom return style fuel system, custom direct port nitrous kit. I also welcome your questions about my methods or how to do things I haven't covered. Calibration: the engine at idle and remove the air cleaner or stick your hand in front of the airstream while watching the O2 readings. Basic terminology. Volumetric Efficiency. This is the OBD I ecm's, using flash proms instead of the conventional removable EPROM of the 1992-93 LT1. Air is directed through a new air intake tube constructed of cross-linked, high-density polyethylene that is designed using extensive computer modeling to maintain proper mass air flow readings and calibration. I have some basics and tips I've picked up as I've tuned my own 1995 Camaro Z28. OBD-II Code P0113 is defined as a Intake Air Temperature Circuit High Input. If I understand this correctly, I'm running rich on the long term? - is rich, + is lean correct? Doing MAF Calibration tuning, how do I know which Mass Air Flow Frequencies to change and how much by these fuel trims I'm. 1 volts, or between 200 and 215 rpm. Mass Airflow (MAF) Circuit Low Voltage Input. Chevy Corvette 1998, Mass Air Flow Pigtail by PSI®. A recent iATN search for the two most common lean codes, P0171 […]. Housed inside the air box is an AIRAID premium air filter for outstanding air flow and filtration. Cats red hot: Rich fuel condition (fuel burning in cat). you still need the maf sensor because the iat1 sensor is integrated into it so unless your going to make a custom fitting to install a stand alone iat1 sensor somewhere and wire it in - just be easier to keep the maf but you can disable it with hptuners and run speed density only still but you need that iat1 for fueling calculations. Higher quality. A better way to find LT1 would be to take your max hr and subtract your resting heart rate. With key on, engine off, at sea level or close to it, you will see about 29. Posting for a friend of mine, parts are located in GA, email: hector moore 52 at hot mail. Accessories & Addons. LT1, 383, D1SC Procharger 16 psi LS1 ignition, 2014 Vette MAF. We made sure every thousandth of an inch was accounted for, that our surface finishes were the best, we road tested openly and extensively, we bench test each unit. It's alot cooler going to the dealer ship and asking for an LT1 or LS1 sensor for your T+ rather than asking for maf for a mini-van. It has an additional analyzer feature to plot wideband readings in cruising range, a commonly requested feature. 0L engines and all ?89-and-later V-8 engines. My lt1 had the same codes popping up. 040 over, comp 276, pacesetter midlengths, using tunerpro and winflash. MoeHorsePower 10-23-2009, 02:16 PM. GM 2 Wire Coolant Temperature Sensor Connector $11. The original O2 needs to stay in place and connected, as it it still being used. We buildup the LT1 engine in our 1996 Chevrolet Corvette C4 coupe with a series of cheap car mods including a new MAF housing thermostat and fuel pressure regulator - Vette Magazine. Now, let’s go for a typical highway cruise, at about 65mph, on a nice flat road: RPM = 1800. What to do: Put in clean air filter. The most probable cause of the idling issue is fouled injectors. There are two types of o2 sensors, narrow band, and wide band. skipping missing inconsistently, did the whole electrical system including opti spark and dist. * 01L ‑ Special non‑Corvette secondary (lower) exterior. The 2001+ style maf's have a fairly different flow curve and PACE therefore modifies their maf to match more closely what your stock PCM is expecting. Lastly, for 1994-2003 flash-based PCMs, I can loan you a kit to load my tunes yourself as well as data-log your vehicle while driving, so that I can tune it completely through email, for one week: 1986-1993 TPI/TBI/LT1 PCM ($225), 1994-1995 LT1 PCM ($225), 1996-1997 LT1 PCM ($225), and 1997-2003 LS1/Vortec PCM ($250). Symptoms of a vacuum leak include the Check Engine light, rough idle, stalling and a hissing sound coming from the engine bay. In the case of a 1351, this wire is above 4. i disconnected the MAF and i couldnt find anything with a good answer to the problem. Plug in the MAF, IAT and optispark vent. Quick test to tell if Mass Air Flow Sensor is bad or dirty which could be causing your car or truck to run bad or keep cutting off. Looking over my recent scan, I'm running all over the place on my Short term fuel trims between -3 and +4. The Mass Airflow Sensor (MAF) measures the amount of air entering the engine. CASE 2: The multimeter DID NOT register 10 to 12 Volts DC, Double check your multimeter connections and retest. In modern engines, the engine control module (ECM) measures or calculates air flow via either a mass air flow (MAF) or manifold absolute pressure (MAP) sensor. Appropriate modifications are then made based on additional inputs, and a specific pulse width is commanded. Another option for 1999 and 2000 year models only, is to buy a non-calibrated MAF, along with the wiring adapter, and then use LS1-Edit to change your PCM's table over to the new MAF table. Mass Air Flow frequency < 1000 hz Engine Speed > = 50 RPM System Voltage > = 10 volts Above conditions met for >= 1. Which in turn will cause bad fuel milage, lack of excelleration when passing, the engine may miss or cut out, & auto transmissions will not shift correctly, the severity of the problems depends on how far out the readings are. I cleaned the MAF, plugged it back in, and it ran great. Most Ford problems related to lean conditions are vacuum leaks and fuel supply. 73:1 rear-gears. Not Helpful 0 Helpful 4. A faulty MAF sensor can cause your vehicle to run too rich or run too lean. An acceptable VE range is between 75% to 90%. As stated prior, 255 is the maximum number that can be displayed. The MAF sensor measures the air and fuel mixture that is sent to the engine. This is especially useful if you are trying to manually override the air and fuel. If the sensor is reading out of range, check for air leaks and/or try cleaning the sensor. A timing belt and chain link the camshaft to the crankshaft, which is how the camshaft gets its drive. [email protected] with a 6. Yes, I am still tuning all the time! In 2020! Your comments about my tuning tips are greatly appreciated. What to do: Put in clean air filter. A good MAF sensor should read about 6 to 9 grams/second when the MAF PID is viewed on a scan tool. MAF Sensor Info. The most common type of mass-flow sensor is the hot wire design: Air flows past a heated wire that s part of a circuit that measures electrical current. 1 month subscription $19. Mass Air Flow By contrast, Mass Air Flow (MAF) systems use a sensor mounted in front of the throttle body that directly measures the amount of air inducted into the engine. A Fellow LT1 Owner. The IC line is the white wire that runs from the black PCM connector pin 5 to the ICM. Designs and sells aftermarket parts and accessories for your late model LS LSX and LT1 vehicle including performance engine and drivetrain components, custom wheels for the street, track, or drag strip, and aero body kits; specializing in the 2009-15 Cadillac CTS-V, 2014+ C7 Corvette and 2015+ Corvette C7 Z06, 2016+ Cadillac CTS-V, 2016+ Cadillac ATS-V, 2016+ Chevrolet Camaro SS, ZL1, Z28, and. 5 v and wide open. The reason being, without mods, I doubt the stock MAF is much of a restriction. An MAF, or Mass Air Flow, sensor is a device used to measure the density of air flowing into the engine. The total mass of air which flows through the engine (as measured by the MAF sensor or calculated using MAP, RPM and IAT) is divided by the A/F ratio (e. Reference interrupt loop Continuous. i cleared the code and 10 minuts later it poped back up again. 1990-1996 LT1 or ZR1 MAT Sensor Relocating Kit Your 1990-1996 MAT Sensor's stock location is near a great deal of heat, causing loss of performance. Our Corvette MAT Sensor Relocating Kit moves the sensor to allow cooler ambient temperature readings. Mass Airflow Meter (MAF). I'm new to Vettes (mostly worked on LT1/LS1 Camaro/Firebirds) so I'm not sure where the components are that require vacuum. Register Product. A dirty, burnt, contaminated, or loose wire will interfere with the sensor signals. A high throttle position sensor (TPS) signal can cause. At any rate, any MAF that is not stock requires tuning in the PCM. From C4 or C5, Eckler's has a MAFsensor that will fit your needs. It's currently got the 2. At idle, warmed up, you will typically see 4-6 gr/sec. The MAP reading doesn't fit. If the increased airflow is within the air meter's sensor range, it simply signals the airflow reading to the controller, prompting increased fuel delivery (assuming the fuel system is up to the task). A bad knock sensor causes a decrease in acceleration and fuel mileage. The engine computer (PCM) calculates how much fuel to inject based on the mass air flow sensor measurements. Even if the fuel pressure was off why is the Mass air flow sensor giving a reading parked at idle of ~4. Better idle with Mass Airflow Sensor unplugged. What's happening: When cold: seems to idle well enough and can push the pedal and get power that one should expect with this car. Management Team. The LT1, 3800 V-6, and LS1 are primarily MAF based, sequential injection with knock control. I clean carb, egr valve, & mass air flow sensor. There are several designs of MAF sensors, but the most common by far is the hot wire MAF sensor. Posting for a friend of mine, parts are located in GA, email: hector moore 52 at hot mail. Add to Wishlist. Airflow and Airmass Calculations The VCM generally uses two airflow related parameters for its calculations: Airflow (grams/sec) and Cylinder Airmass (grams/cyl). AC Delco LT1 Gen V 5 MAF Mass Air Flow Sensor IAT Intake Air Temp LT L83 L86 LT4 SKU : SEN027. If the fuel system on your particular 4. 0 v, and wide open throttle with 0"Hg will put out 4. 5 before I did the reset. Lastly, for 1994-2003 flash-based PCMs, I can loan you a kit to load my tunes yourself as well as data-log your vehicle while driving, so that I can tune it completely through email, for one week: 1986-1993 TPI/TBI/LT1 PCM ($225), 1994-1995 LT1 PCM ($225), 1996-1997 LT1 PCM ($225), and 1997-2003 LS1/Vortec PCM ($250). Then, disconnect and reconnect connector to refresh electrical connection of the MAF wiring harness. I, like you, am a car enthusiast who has found the value and fun-factor in the LT1 engine. Torque upper brace mounting nut at intake manifold to 24 lb. The Michigan FBody Association is a centralized website for FBody enthusiasts to discuss what's going on in the Michigan area. I would really appreciate any suggestions. For LT1, spark is calculated in terms of MAP, just like speed density. They feature many different stage options, utilizing many of the Livernois Motorsports products. Description This is a Genuine GM Performance cold air intake for your LT1 LT4 LT5 2014-2019 Chevrolet C7 Corvette. The car has not been starting right. less susceptible to heat soak than the original equipment aluminum units providing cooler more accurate air temperature readings for even greater performance and efficiency gains. Discussion Starter • #1 • Feb 3, 2012. 10 gears, eaton true-trak posi, march performance pulleys, pcm tune by PCMFORLESS, sprints, Lil Ron Auto Fashion House(painter), Z28 cluster from bob94, more mods to come. Start and let the engine idle. A majority of the "failed" sensors we retrieved from dealerships had not failed at all. * 00L ‑ Only primer secondary (lower) exterior. 80 volts at idle (if your reading indicates 12 volts or pretty close to it,. Recommended Reading. I, like you, am a car enthusiast who has found the value and fun-factor in the LT1 engine. Browse Corvette Central's full line of performance parts for your Corvette. Postgraduate vacancies. Lastly, for 1994-2003 flash-based PCMs, I can loan you a kit to load my tunes yourself as well as data-log your vehicle while driving, so that I can tune it completely through email, for one week: 1986-1993 TPI/TBI/LT1 PCM ($225), 1994-1995 LT1 PCM ($225), 1996-1997 LT1 PCM ($225), and 1997-2003 LS1/Vortec PCM ($250). Mass Airflow Sensors (MAF) report the amount or density (Mass) of the air entering the engine to the Powertrain Control Module (PCM). Earls Performance. 5V when snapping the throttle open and closed. It was reading 28. P0102 Mass Air Flow MAF Circuit Low Technical Description. 7L 1995, 95mm Mass Air Flow Sensor Kit by Edelbrock®. JACUSTOMER-pmqbryft- : Fuel pressure was checked by a mechanic and he said it was fine. 3 TO 5 Wire MAF Adaptor Harness. About this clamp: Venturi-effect, tapped exhaust clamp for obtaining accurate lambda measurements in non-cat autos or other engines. Here's what it looks like on a digital multimeter: At an idle of about 680 RPM's, the MAF. It's alot cooler going to the dealer ship and asking for an LT1 or LS1 sensor for your T+ rather than asking for maf for a mini-van. here is an LT1 Performance motor, only changes are the heads and Cam Chevrolet Performance engineers have wasted no time digging into the new LT engine family to mine more power - and they've delivered it in the LT376/535. This is a "MAF TRANSLATOR BOX AND A LS1 MASS AIR FLOW SENSOR" for a 1986 or 1987 Buick Grand National, T Type, Turbo T, or GNX 3. The readings looked close at idle and cruse, but were off over 50 grams at full throttle. Step 5 – Connect MAF to new kit. Common symptoms of a bad engine coolant sensors are overheating, hard starting conditions, poor idle, check engine light ON and the electric fans do not work properly. TunerPro RT ( link) and TunerCATS ( link) are the two most commonly used software packages for OBD1 GM. 5 volts which per Haynes is the voltage it should read at 60mph moving under load?. 4th Gen Camaro LT1 (1993-1997 Camaro) Feb 15, 2004: MAF Screen: 4th Gen Camaro LT1 (1993-1997 Camaro) Feb 5, 2010: Help with a p/n replacement for oil pikcup screen? 4th Gen Camaro LT1 (1993-1997 Camaro) Oct 20, 2008. Port EFI designs (an individual injector for each cylinder) are referred to as dry flow. Payment Options. Below is the pinouts for the ecm #'s 1226870 (1985 only) and 1227165 (1986-89) Make note that the 1985 ecm/harness is NOT interchangeable with the 1986-89 ecm/harness. MAF readings are 3 g/s at idle and about 190 g/s when accelerating above 100 km/h Ambient / intake / engine coolant temperatures are all within specs and logical. Cars can have either an analog or digital mass air flow sensor. Welcome to the Jaguar Check Engine Light codes page. There is another way to adjust your fueling at WOT which is by reading your AFGS in your datalog and finding the corresponding table in your MAF table and adjusting it by a % at a time until your commanded AFR is equal to your actual. Scanmaster is needed to figure out the air flow readings, that is pretty much mandatory. Lastly, for 1994-2003 flash-based PCMs, I can loan you a kit to load my tunes yourself as well as data-log your vehicle while driving, so that I can tune it completely through email, for one week: 1986-1993 TPI/TBI/LT1 PCM ($225), 1994-1995 LT1 PCM ($225), 1996-1997 LT1 PCM ($225), and 1997-2003 LS1/Vortec PCM ($250). Refer to Diagnostic Trouble Code (DTC) List - Vehicle. Positioning of the MAF is critical, I have seen and documented 4 unique MAF calibrations on the 94-95 LT1's. This is important information that the Engine Control Module (ECM) needs to calculate the proper amount of fuel quantity and ignition timing. So, I'll be needing a 3. I have been suspect of mine for possibly giving incorrect readings even though it has not tripped a trouble code. Quick test to tell if Mass Air Flow Sensor is bad or dirty which could be causing your car or truck to run bad or keep cutting off. A fuel-injected engine may alternatively use a mass airflow sensor (MAF sensor) to detect the intake airflow. C4 Corvette Dressed for the Nines. This way the sensor can get an accurate reading from all cylinders of the motor. The 2001+ style maf's have a fairly different flow curve and PACE therefore modifies their maf to match more closely what your stock PCM is expecting. 69702 GM LT1 58 mm Throttle Body B. wires, 160 hypertech, f-body maf, long tube headers, 2. Advanced Tips for EFI Tuning with Fuel Pressure Changing the fuel pressure on an EFI System is an effective method of affecting engine performance and making more power. Turbocharged engines may use both, but. So the Z32 mass air flow sensor's capable of reading somewhere around about 500-550 horsepower. It did this before and after the MAF was swapped. [email protected] with a 6. 8 #/Min x 7. There are two types of MAF sensors. More revving, 3087 rpm gives 2. 3L 2300 Edelbrock E-Force Supercharger Kit bolt on, best lowest sale price at WEAPON-X Motorsports The Edelbrock E-Force Supercharger uses the Eaton Gen VI 2650 TVS Supercharger rotating assembly with a four lobe design with 170 degrees of twist for maximum flow, minimum temperature. This system opens up additional air box volume and utilizes a high-flow dry media filter. Many MAF units have screens and they can get clogged up easily, clean using a CRC 05110 spray. Chevy Camaro 5. Reference interrupt loop Continuous. 1 … Go to page. Free Same Day Store Pickup. If you are able to view the MAF sensor signal voltage on an OBD2 scanner, then do so. I clean carb, egr valve, & mass air flow sensor. The late TPI ECM (right) continued to use a MEMCAL, but relies on engine vacuum readings (through a MAP sensor) to calculate fuel delivery rather than measuring the amount of incoming air (through a MAF sensor). Tuneable Items. 7 to 19 MPG. Can be caused by un-metered air being pulled in downstream of your MAF, dramatically retarded timing, low spark intensity (incomplete fuel burn), possibly a bad optispark, even a cam installed wrong. The new design incorporated sheet moulding compound (SMC) made from chopped fiberglass and polyester resin for the roof, hatch, doors. Which in turn will cause bad fuel milage, lack of excelleration when passing, the engine may miss or cut out, & auto transmissions will not shift correctly, the severity of the problems depends on how far out the readings are. NOTE: Some 94 & 95 models do not have the B terminal. If the engine stumbles or stalls, the sensor is faulty. I just did a Ford with a bigger MAF only because it was calibrated to larger injectors so I could still run the Ford computer. Yes, but the '85-89 computers were all mass air flow (MAF), which is expensive and is susceptible to damage by dirt or water (new GM replacement is about $300). The FlowErr mode is for logging data to assist tuning. Air is directed through a new air intake tube constructed of cross-linked, high-density polyethylene that is designed using extensive computer modeling to maintain proper mass air flow readings and calibration. Recommended Reading. As stated prior, 255 is the maximum number that can be displayed. 7-liter (350 cu in) small-block V8 was standard on the Impala SS, making 260 horsepower (190 kW) and 330 pound-feet (450 N·m) of torque (retuned from the prototype's 300 horsepower (220 kW) rating). The gear is clean as a whistle. Torque upper brace mounting nut at intake manifold to 24 lb. The is an introduction to tuning with a programmable electronic fuel injection ECU. Dart shp ls next pro 434 engine. 0 range (18% less than normal). This programming is for any 1994 or 1995 lt1 engine, applicable service numbers will be located on the PCM and end in either 051 or 333 (available in Caprice, Roadmaster, Cadillac, Camaro, Firebird/Trans Am, and Corvette). 7L 1996, 95mm Mass Air Flow Sensor Kit by Edelbrock®. 6 Timing -25. a tuning guide i found based on hptuners. 1995 firebird, rebuilt. CASE 2: The multimeter DID NOT register 10 to 12 Volts DC, Double check your multimeter connections and retest. And the chart would tell you what the ohm reading was supposed to be at certain temperatures. It's alot cooler going to the dealer ship and asking for an LT1 or LS1 sensor for your T+ rather than asking for maf for a mini-van. 1L V8 Engines (1999-2010). It's currently got the 2. To inspect for an exhaust leak, have a helper start the engine and hold the idle at about 1500 rpm, listen for additional exhaust noises. Both outputs are sent to the engine control module to regulate air-fuel mixture and the automatic transmission system. If you are missing any components, we suggest you try to obtain the specific pieces from a dealer, after informing him of the specific year, and model of the wiring. 5" MAF pipe & sensor. There are a number of common symptoms of a bad crankshaft position sensor (CKP) that can help you determine if your sensor has failed, including engine misfires, rough idling, stalling, or hard starting. The car has not been starting right. 5V when snapping the throttle open and closed. Welcome to the Jaguar Check Engine Light codes page. Fuel pressure was within specifications (45-50 psi) and the MAF was reading correctly, I thought!. The symptoms of a bad mass air flow sensor include low engine power, poor fuel economy, an engine that won't start, a check engine light on the dash and a gas smell from the exhaust fumes. 8 liter turbo V6. Edit: Before changing the mass air flow sensor and the ACDelco 217-427 Valve Assembly (for Idle control) I was getting 18. The 'Glass Menagerie - December 2013. Once we have MAF integrated over time, we can calculate fuel flow using a specific air/fuel mixing ratio (A/F). It looked pretty rough. 501-1100: 2016+ SS POLISHED COLD AIR INTAKE The plastic injection molded MAF housing ensures proper airflow readings to keep your AFRs close to stock. The 2014 Chevrolet Cruze has 883 problems & defects reported by Cruze owners. Joined Feb 2, 2010 · 309 Posts. Read More. 5 mpg and slowly. Welcome to our newest member, whatthekrapp. Discussion Starter • #1 • Feb 3, 2012. Unmeasured air reaching the combustion chamber can also result in an inaccurate MAF reading. I went to a Oreillys to get a OBD reading and it was having the following codes. Reference interrupt loop Continuous. I have gotten a small bit of help off the EFI boards, but none to fix the solution. It started but cut right back off. 3 TO 5 Wire MAF Adaptor Harness. The LT1 f-Body 1994 TA does not have an ESC (Electronic Spark Control). Rest of car is stock. If you are missing any components, we suggest you try to obtain the specific pieces from a dealer, after informing him of the specific year, and model of the wiring. OBD-II Code P0113 is defined as a Intake Air Temperature Circuit High Input. An exhaust system manages both pressure and vacuum cycles while an engine runs. Pulling codes for the is same as for the earlier TPI systems on the 1992 through 1995 F body (Camaro-Firebird). Using sensor safe carburetor cleaner to clean this filament can sometimes remove these deposits allowing the sensor to obtain a correct reading. This was one of the main differences between the 93 and 94+ F-Body cars (and 92-93 Vette's compared to 94-96) and one of the items that makes a 93 model unique. leav it disconnected and get a new one when u can it wont hurt it driving it around for a lil while like that just remember when the. Converting °C to °F: (°C x 1. 1995 firebird, rebuilt. This article will show you how to do it and in the process, you'll be able to say that ‘Yes, the MAP sensor is bad and the cause of the problem’ or ‘No, the MAP sensor is OK and I have to. txt) or read book online for free. Add to Wishlist. Most Ford problems related to lean conditions are vacuum leaks and fuel supply. The 1351 is the Ignition Control (IC) circuit from the PCM to the ICM. 5" LT1 MAF's use the same frequency range so our ECM can read the full range, although the air flow at the same frequency is different, of course. I have Auto Zone, Advanced Auto, Napa and Car Quest all in my neighborhood. Another option for 1999 and 2000 year models only, is to buy a non-calibrated MAF, along with the wiring adapter, and then use LS1-Edit to change your PCM's table over to the new MAF table. Some vehicles come equipped with both a MAP and MAF sensor, usually forced induction systems like turbocharged and supercharged models. wires, 160 hypertech, f-body maf, long tube headers, 2. com was created to allow for an easy one-stop place to find out what's going on in Michigan as far as FBody events, to find out what clubs are available in your immediate area, and for an easy place to post. 5L GM equipped vehicle is a speed density system, the MAP sensor is one of the most important sensors the fuel injection computer needs to keep the engine running optimally. All fuel trim readings are at 0. leav it disconnected and get a new one when u can it wont hurt it driving it around for a lil while like that just remember when the. The fuel pump receives the fuel from the fuel tank and throws it into the fuel rail which. Understanding MAF Sensors - Technically Speaking. It has long tubes on it also, but I am not sure if they were already on the car. This is the first OBD1 LT1 that I have ever touched. With MAF you adjust the MAF Flow vs MAF Correction table to get a decent AFR. i disconnected the MAF and i couldnt find anything with a good answer to the problem. A dirty, burnt, contaminated, or loose wire will interfere with the sensor signals. September 25, 2019. Meanwhile I made another patch, It forces SD mode while keeps display of Maf readings and adds display of VE table calculated airflow. In 1990 the MAF was replaced with the MAP sensor, in 94 the MAF returned with a MAP sensor. The Mass Air Flow Sensor (also known as the MAF) is one of the main electronic components of the fuel delivery system. MAP sensors respond to changing conditions very quickly, enabling it to have fairly good transient response especially compared to Mass-Air-Flow; Compared to a carburetor, it allows much more control over the mixture at different engine loads. 100% computer-tested to ensure the ECU receives accurate airflow readings under hard engine. A faulty mass air flow sensor may also have similar symptoms to low fuel pressure, which indicates a bad fuel pump. The Caprice and Camaro units are different size. LT1, 383, D1SC Procharger 16 psi LS1 ignition, 2014 Vette MAF. How to Test Fuel Injectors. If MAF was bad to run 18% lean you MAF would have to be in the 3. It runs and idles better than it ever did with any plastic MAF, including two GM originals. txt) or read book online for free. Re: GMs Tables and Lookups (what they did with the LT1) In fact you can unplug the MAP and the MAF and it will run in Alpha-N mode(TPS only). 1996 Corvette Overview. Mass Air Flow frequency < 1000 hz Engine Speed > = 50 RPM System Voltage > = 10 volts Above conditions met for >= 1. I'd also just ditch the stock maf if its bad, and get a 3 inch LT1 and a MAF translator. There are posted MAF tables for our cars for the LT1 and LS1/LQ4 MAFs, but not sure of hte Z06 MAFs. This is the look I wanted for my LT1 but the problem was the LT1 MAF is not on the engine block. The stock MAF on my Camaro’s LT1 is 3. The fuel injectors in your vehicle are designed to spray fuel into the cylinders of your engine where it is combined with air and compressed before being ignited by the spark plug to produce power. Below is the pinouts for the ecm #'s 1226870 (1985 only) and 1227165 (1986-89) Make note that the 1985 ecm/harness is NOT interchangeable with the 1986-89 ecm/harness. Mass Airflow Sensors (MAF) have the responsibility of reporting the amount of air entering the engine to the Powertrain Control Module (PCM). The 1996 LT4 was a derivative of the LT1 that was introduced back in 1992. Turn on the key but don't start the car and check the voltage and/or adjust the sensor to get that reading. I wanted to give back to the same community that has helped me over the years with my other LT1 projects. A rich fuel mixture can be caused by a header/exhaust leak sucking in fresh air, causing. The most common symptoms of a bad MAF sensor are: A MAF sensor code. After that, I wanted to adjust the MAF table according to the config of MAF-STFT, and it did not work as I just installed the V 3. There are two types of MAF sensors. I want to add a MAF frequency display too and it will be released. The exceptions are the 1984 Corvette that used a speed density system--a sort of predictive method of measurement---and the 1990 through 1993 C4 models which were also speed density based. C4 Corvette Sensor Coolant Temperature P/N 25036708 : 185 Ohms @ 210F, 3400 Ohms @ 68F, 7,500 Ohms @ 39 F. The late TPI ECM (right) continued to use a MEMCAL, but relies on engine vacuum readings (through a MAP sensor) to calculate fuel delivery rather than measuring the amount of incoming air (through a MAF sensor). Problems mass air flow sensor symptoms ls1 MAF Sensor Fault Code - Technically Speaking - Vette Magazine 17 Mar 2009 If the computer does not recognize a signal from the MAF sensor, it will down problems to diagnose if you have an issue with the MAF sensor or not. 5V when snapping the throttle open and closed. The readings looked close at idle and cruse, but were off over 50 grams at full throttle. The knock sensor is a technically advanced sound sensor in the engine that adjusts the timing of the ignition, enabling a smooth ride. If you’re going with the speed density setup, you can realistically put any filter you choose directly on the throttle body, or just a straight or 90-degree pipe with a filter on the end. At first i thought my MAF was bad -- i was getting 12V at the fuseblock for fuse 11, which is the shared fuse for the transmission, MAF and one other thing in the engine. The 1994 and later LT1 engines are sequential injection and use a MAF system with MAP as a back up. I have been suspect of mine for possibly giving incorrect readings even though it has not tripped a trouble code. The LT1 f-Body 1994 TA does not have an ESC (Electronic Spark Control). In modern engines, the engine control module (ECM) measures or calculates air flow via either a mass air flow (MAF) or manifold absolute pressure (MAP) sensor. Register Product. MAF sensors calculate ingested air based on measurement unlike the MAP sensors that infer the amount of air based upon readings and lookup tables. eric, to edit the maf table, you adjust the air flow numbers. NOTE: Some 94 & 95 models do not have the B terminal. NOTE: Some 94 & 95 models that DO have the A & B terminals still require a scanner. Ford Mercury Throttle Position Sensor Repair Connector Pigtail 1991 Up $9. The most common symptoms of a bad MAF sensor are: A MAF sensor code. The 1996 model year would mark the final year of both the C4 and the Generation II small block engine that powered it. The LT1 MAF is twice as large as the Ford 5. When working on an ACURA years ago, in the shop manual, there was a chart used to test the mass air flow sensor. 0 so I'd say no. The vehicle has no drivability concerns and was hard to diagnosis. I noticed that idle in SD mode is so much better. Epic SRK B/S thread of 2019. "Faking out" an oxygen sensor refers to the process of bypassing the sensor so that the sensor does not relay the correct information to the system's computer. i spent about 2500 guessing trying to fix the problem. We have everything you might need or want to keep any generation Corvette in great shape, while keeping you in style. Set your digital meter at or close to 20 Volts DC (direct current). Newer vehicles use long-life radiator coolant that is specially formulated to last up to 150,000 miles or five years in-between changes. Compare your readings with those specified in your vehicle service manual. The throttle position sensor in your engine transmits information about the position of your throttle to the electronic control module or ECM. LT1 Stock MAF readings -- What to Expect? Jump to Latest Follow 1 - 4 of 4 Posts. yes you must have two knock sensor signals for the caprice/impalla to run right. The most obvious difference is the lack of mass air flow (MAF) sensor in the 90-92 setups. TPI MAF Sensor (1985-1989) The TPI MAF sensor outputs a 0-5V analog signal to the ECM. Can be caused by un-metered air being pulled in downstream of your MAF, dramatically retarded timing, low spark intensity (incomplete fuel burn), possibly a bad optispark, even a cam installed wrong. Looking for an Affordable, In Stock, Plug and Play wiring harness for your LS Swap? PSI sells Standalone Wiring Harnesses for GM Gen II, III, IV, & V LS/LT based engines and transmissions. Text Us: 336. The 94/95 LT1 PCM is OBD-I, The 96/97 LT1 PCM is OBD-II. This Item: MAF Translator For Turbo Buick Grand National & T-Type 86-87 ; 3" MAF (Mass Air Flow) Sensor from Impala SS LT1. It was a used MAF, but low mileage and I don't see it being likely that both would have the same issue. Check engine control systems with a scan tool. The stock MAF on my Camaro's LT1 is 3. SCT Vehicle Performance Programmers. Port EFI designs (an individual injector for each cylinder) are referred to as dry flow. MAF Only Below RPM: Use MAF exclusively below the specified RPM. 100 PSI Liquid Filled Fuel Pressure Gauge 0-100 PSI WITH Adapter for LS engines /LT1 (92-97) and L98 (TPI) CHEVROLET CHEVY CORVETTE CAMARO $ 29. A recent iATN search for the two most common lean codes, P0171 […]. I've had baro sensors (plural) replaced, MAF sensor twice, 100's of $'s in diagnostics, and I still get the code intermittently. We made sure every thousandth of an inch was accounted for, that our surface finishes were the best, we road tested openly and extensively, we bench test each unit. Converting °C to °F: (°C x 1. I can double check at some point. This information is used by the Electronic Controller Unit (ECU) to determine the amount of fuel needed to achieve the stoichiometric ratio consisting of 14. After that, I wanted to adjust the MAF table according to the config of MAF-STFT, and it did not work as I just installed the V 3. I have seen it many times on these vehicles. Switches: simple enable/disable of systems and their respective checks, like CAGS (skip-shift), EGR, AIR, VATS, VSS, etc. I figure if the engine was overheating, perhaps burning and on fire, and the ECT sensor had an extremely high reading, the computer would shut down the fuel pump. Edelbrock's high flow Mass Air Flow Sensor (MAFS) is a perfect upgrade for any MAFS equipped vehicle with performance upgrades that have elevated air flow above the range. Is Your TPS Connected to Ground?. It started but cut right back off. You would test the ohm readings on certain wire connecting to the MAS. Examining the tips of the spark plugs as they are removed can reveal a great deal about the health and performance of an engine. Aerostar - rough idle, engine misses. LT1, 383, D1SC Procharger 16 psi LS1 ignition, 2014 Vette MAF. After that it's all good. The worst complaints are accessories - interior, steering, and lights problems. MAP sensors respond to changing conditions very quickly, enabling it to have fairly good transient response especially compared to Mass-Air-Flow; Compared to a carburetor, it allows much more control over the mixture at different engine loads. Part Categories. Visually inspect the electrical connector and terminal for dirt or damage. When idle after a long drive, IAT sometimes reach more than 95 degree Celsius while ambient is around 30 degrees. Mass Airflow Sensors (MAF) have the responsibility of reporting the amount of air entering the engine to the Powertrain Control Module (PCM). 100% computer-tested to ensure the ECU receives accurate airflow readings under hard engine. 0 Harness Wiring Info TONS OF INFO HERE, Please Read all the pages linked. NOTE: Some 94 & 95 models do not have the B terminal. LT1 Scanmaster Manual Scanmaster. The 1351 is the Ignition Control (IC) circuit from the PCM to the ICM. Tuneable Items. One sensor measures the ambient temperature of the incoming air. Long term fuel trims are -6. Quick test to tell if Mass Air Flow Sensor is bad or dirty which could be causing your car or truck to run bad or keep cutting off. I've got an Eaton G80 posi for an 8. Lastly, for 1994-2003 flash-based PCMs, I can loan you a kit to load my tunes yourself as well as data-log your vehicle while driving, so that I can tune it completely through email, for one week: 1986-1993 TPI/TBI/LT1 PCM ($225), 1994-1995 LT1 PCM ($225), 1996-1997 LT1 PCM ($225), and 1997-2003 LS1/Vortec PCM ($250). low mass air flow rates) region is most sensitive. The1990-92 TPI system still operates the same except that Manifold AirPressure is used to calculate injector pulse width as opposed to airflow. It also will shoot the P0101 MAF code because the computer is reading more air coming in than what the maf is sensing so it triggers the code P0101 meaning that the readings from the maf were out of range for a period of time, usually four seconds, though there are other time ranges as well. Benjamin Jerew is an ASE-certified Master Automobile Technician with over a decade of experience in auto repair, maintenance, and diagnosis. 7-liter V-8, the same power pump provided for the police car and a direct and close descendent of that used in the Corvette. 2003 Chevrolet Corvette problems. So, I'll be needing a 3. The exceptions are the 1984 model as well as the 1990-1993 editions, which all used. and the lower, back brace bolt to 18 lb. In order for the ECU to function properly, the MFA flow rate must be within a preset range of values and if the MFA communicates a number too low, the ECU won’t function effectively. Attention is particularly drawn to the following points concerning repairs and the fitting of replacement parts and accessories: Safety features embodied in the vehicle may be impaired if other than Land Rover parts are fitted. that's why i'd pull through the maf and not push boost into it. Contains unread. But, once you have a cam, heads, and all the boltons, well, that sucker wants to breathe. '94 LT1 Never-ending problem Caprice Car Forums. 01-23-2011, 10:02 PM. is equipped with either a MAP sensor or a MAF sensor. 413 which is about as low a reading as it has given so far. Road tested and ready to perform. The Caprice and Camaro units are different size. Engine knock is monitored by a sensor installed into the water jacket. 100 PSI Liquid Filled Fuel Pressure Gauge 0-100 PSI WITH Adapter for LS engines /LT1 (92-97) and L98 (TPI) CHEVROLET CHEVY CORVETTE CAMARO $ 29. To troubleshoot the fuel injector system in your LS1 swap, you should always check your MIL status first for any stored check engine lights. 5” MAF or even a 4” MAF from a Z06 Corvette on the 4. GM MAP sensor Identification How to identify a GM MAP sensor. We buildup the LT1 engine in our 1996 Chevrolet Corvette C4 coupe with a series of cheap car mods including a new MAF housing thermostat and fuel pressure regulator - Vette Magazine. I also welcome your questions about my methods or how to do things I haven't covered. COM ECM PINOUTS. Accessories & Addons. Some vehicles come equipped with both a MAP and MAF sensor, usually forced induction systems like turbocharged and supercharged models. 1 volts, or between 200 and 215 rpm. I turned on the idle valve. Refer to Diagnostic Trouble Code (DTC) List - Vehicle. Personally I don't see a need for all these backup modes. Plug in the MAF, IAT and optispark vent. MAF Only Below RPM: Use MAF exclusively below the specified RPM. Airaid CAD Cold Air Intake (Race Specific) 2015-17 Ford Mustang GT 5. How to Test a Mass Air Flow MAF Sensor - Without a Wiring Diagram - Duration: How to Check your GM LT1 V8 MAP sensor - Duration: 3:48. 5" diameter which you can clamp the intake hose and rubber snorkel/elbow to, thereby. In PARK and holding the gas pedal/RPM at typical highway speed the engine has a bad miss. It runs and idles better than it ever did with any plastic MAF, including two GM originals. One sensor measures the ambient temperature of the incoming air. This will be a huge work in progress. Joined Feb 2, 2010 · 309 Posts. Built-in velocity stack, promotes airflow. Classic Industries offers a wide selection of Chevrolet Impala parts, including Chevrolet Impala interior parts and soft trim, Chevrolet Impala exterior sheet metal, Chevrolet Impala moldings, Chevrolet Impala emblems, Chevrolet Impala weatherstrip and unique accessories, to nearly every nut and bolt needed for installation. ScannerDanner 74,454 views. here is an LT1 Performance motor, only changes are the heads and Cam Chevrolet Performance engineers have wasted no time digging into the new LT engine family to mine more power - and they've delivered it in the LT376/535. Chevy Camaro 5. This is important information that the Engine Control Module (ECM) needs to calculate the proper amount of fuel quantity and ignition timing. We made sure every thousandth of an inch was accounted for, that our surface finishes were the best, we road tested openly and extensively, we bench test each unit. Fuel injectors are considered to be dirty when the hydrocarbons and additives which all forms part of today’s fuels, together with engine gunk and carbon, cause the injectors to become restricted. Apply 20 in-Hg of vacuum now. Lastly, for 1994-2003 flash-based PCMs, I can loan you a kit to load my tunes yourself as well as data-log your vehicle while driving, so that I can tune it completely through email, for one week: 1986-1993 TPI/TBI/LT1 PCM ($225), 1994-1995 LT1 PCM ($225), 1996-1997 LT1 PCM ($225), and 1997-2003 LS1/Vortec PCM ($250). At 2397 rpm the MAF is reading 1. If the values are out of specification, replace the MAP sensor. Mass air flow sensor from Eckler's Corvette will get your classic Vet running right. Backprobe the signal and ground wires (red probe to signal and black probe to ground). The most common type of mass-flow sensor is the hot wire design: Air flows past a heated wire that s part of a circuit that measures electrical current. Fuel pressure was within specifications (45-50 psi) and the MAF was reading correctly, I thought!. 5 on my car, and a friend of mine has the 3" maf on his. The sensor resistance decreases as the surrounding air temperature increases. To troubleshoot the fuel injector system in your LS1 swap, you should always check your MIL status first for any stored check engine lights. 440 lb/min rate.