Car Runs Without Maf Sensor

With the addition of a supercharger or turbocharger, the mass air flow sensor must still be changed; Stock mass air flow sensors are high quality pieces, but with increased air flow processed by the engine, an aftermarket mass air flow sensor becomes a necessary modification in order to safely make more power. The MAF sensor uses a heated wire or filament to measure airflow into the engine. This can cause major damage to the sensor. The reason the engine runs better with the MAF unplugged is because it is operating on the backup system; the Manifold Absolute Pressure (MAP) sensor. MAF unplugged it runs fine. Today, the Chinese giant has launched the Mate 30 series. Yours may be different, requiring different tools,etc. Don’t forget to ask the community (forum) for help. hey guys having some troubles with my 1998 volvo s70 t5 car has 220 thousand and just bought this car i thought my mass air sensor was gone so i replaced it still the same issue once i have the mass air unplugged the car will run and idle fine but no power at all and will rev to 4000 thats it and. The MAF sensor is very sensitive to vacuum leaks because it is measuring the amount of air coming into the engine, through the intake. If I warm the car up, shut it off and disconnect the O2 sensor, it seems to run smoother when started back up. MAP sensor VS. I know what the sensor. Car will only run when MAF is disconnected, but rough. If it runs better without the sensor working, again this shows it has been damaged or is dirty. The mass air flow sensor senses the total amount of air passing the sensor and allows the fuel injection system to adjust the fuel mixture to compensate for cold weather and/or high altitude conditions. We have tested many MAF sensors claimed to be damaged. Via kill switch (it's a track car) then it will start but dies instantly until maf is plugged back in. It read 780 ohms. By unplugging the MAF you are forcing the computer into speed density mode with a preset set of parameters. Q: If you unplug the mass air flow sensor the car will start. )sensor is unplugged,or the vacuum (some had a vacuum line) to it is lost,the engine will not. On a mk4 the car still starts and runs without the maf even plugged in. Hi, My car is really sluggish, so after a bit of reading up on here i disconnected the MAF sensor and it goes like a different car. Everyone did it). There is a sensor on the air intake called the mass air flow sensor. Leaving aside the moment in January when I gracefully pirouetted an Infiniti QX70 into a snowbank, all my near misses for years now have involved an A-pillar. The MAF codes can be 66 or 25. Frequency table will need modification. Without a new sensor, the check engine light will remain on. But anything else this means? I cleaned the MAF sensor with spray MAF cleaner and no change. The air is then mixed with the fuel, and combustion is the result. Diagnosing a bad or failed air intake temperature sensor. but while driving it the other day at a drive thru i noticed a HARD MISFIRING WHILE running AND IN OD but no check engine light ( so this might be from a loose plug wire or???? ) anyways if my MAF SENSOR was already disconnected should i leave it disconnected or listen to my car lol!!!. and running about 14psi of boost. My Mass Air Flow sensor and the car was stalling all the time. Depending on the make and model, your car uses either a hot-wire (the most common) or a hot. VAG indicated something about a fuel trim in banks 1 and 2, system running too lean. Clean your MAF with a spray product called "Mass Air Flow Cleaner" (how original, yes?) I use it on my car. good luck. In an internal combustion engine, the expansion of the high-temperature and hhigh pressure gases produced by combustion applies direct force to some component of the engine. The fast idle air then adds to this baseline amount of air to raise the idle speed. Still running strong after a couple days to / from work. The MAF sends readings to your computer, which then uses them to adjust the mixture of fuel/air in the combustion chamber. You will probably get advice on that the o2 sensor codes are just acting because the maf is bad or unplugged, but most likely the o2 sensors need to be. Then, measure the voltage between MAF sensor connector terminals C and D. Furthermore, a bad oxygen sensor could expose you to carbon. some cars will not run without this and it's usually in the the in-car computer that oversees engine. Hope this helps someone else. It's a way for those interested in status to show they are wearing the Pros. These problems are similar to those caused by a faulty fuel pump. i was cleaning the MAF, for my BMW 323i 2000, But i broke it while cleaning, so now i am driving with Gear signal on board, the car still running good, but jumping when shifting from gear one to gear two, as well when slowing down,, i ordered new AIR MASS, QUESTION/? is there any side effects could appear if i drive for while without MAF,?. The O2 sensor codes will be set if the O2 sensor readings remain low (lean), or high (rich), or do not change quickly enough, or do not change at all. All intake air must flow through the sensor. Using a screwdriver, lightly tap on the sensor while the engine is running. Began receiving a Restricted Performance (RP) amber light off and on for a few days. Fuel pressure is good, spark is good, and the fuel filter is clean. It is better to just replace the sensor as soon as possible before your problems get worse. If the car continues driving with a bad MAF sensor and the check engine light is on, the engine may begin to breakdown or fail. Time Since Engine Start -- Shows the time the engine has been running since it was last started. I think you can safely say the MAF is at fault given symptoms improved with a clean and now the car runs better without it, I would repalce it now. MAP sensor. [Query:] I have a 1985 740t with 244,000 miles and a m47 manual transmission. Mass Air Flow (MAF) sensor. That is the amount (mass) of air the engine is sucking in. Combined with a calbration, this determines how the engine will operate. Thanks for your replies no matter how ridiculus my questions may sound. I turns out that your MAF has gone bad. But this only happens when the engine, and outside temp is cold. Find helpful customer reviews and review ratings for Denso 197-6030 Mass Air Flow Sensor at Amazon. The car runs better without it plugged in. Shop For Chevrolet with confidence. Parting Tips. 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 maf is unplugged the pcm cant tell how much air is. The OBD II system can't evaluate the converter if the upstream and downstream O2 sensors are not functioning normally. Readily available ‘generic’ scan data provides an excellent foundation for OBD II diagnostics. All you need is a multimeter. Rough Idle can also be caused by a dirty MAF, clean it first, you may need a new one but lets keep it simple. You know you must use Premium fuel no matter what, most BMW owners don't and end up expending lots of dollars later on repairs. Alfawise LS02 1080P FHD dash cam can record the video of the vehicle on the driving road. If you exceed. The computer is programmed to accept this information when the car is running in any mode. If that engine doesn't have a MAF, the MAP becomes the most important sensor under the hood next to crank position. Can you drive without a mass airflow sensor? Best Answer: Your car should run, but very poorly. Conclusion: Your BD Turnkey Engine is going to run VERY good when you get it. Hope this helps someone else. A car’s A-pillars are the windshield. Technician A says that the sensor should show over 100 grams per second on a scan tool display when the accelerator is depressed to WOT on a running engine. My Mass Air Flow sensor and the car was stalling all the time. Testing hasn’t been without its difficulties, though. When you unplug the MAF the computer sees the failure and goes to a "backup plan" that smooths out the rough running (if the sensor was causing it). Check the mass air flow sensor for damage. Note:'97-'98 MAF tables end at 11,250Hz. What the Home Mechanic Needs to Know About O2 Sensors - An Article from the OBDII Technical Library Today’s computerized engine control systems rely on inputs from a variety of sensors to regulate engine performance, emissions and other important functions. This sensor is also the one that operates the dashboard coolant temperature gauge, and is necessary to operate and run the motor in whatever swap you are putting it in. Testing the Ford mass air flow (MAF) sensor on all of the Ford, Lincoln and Mercury cars and trucks is a very simple test that can be done without a scan tool. Some MAF sensors also include an intake air temperature (IAT) sensor that helps the PCM calculate air density. If your car is running badly or it is just not as smooth as it used to be your MAF sensor could well be the cause. Once the problem is identified and fixed, clear and reset the codes again and drive the car some distance. If your car is running rough, hiccuping, or having trouble starting you may have a dirty Mass Air Flow sensor, commonly referred to as a MAF sensor. If you believe your car has a faulty mass air flow sensor, take it to a qualified mechanic so that a complete computer diagnostic can be run. O2 sensor is brand new, running a TT chip, can't get any cruise numbers right now bumpers are off the car and it's running lean with the MAF plugged in so I figured best not to drive it much right now. 8L V6 equipped cars. By continuing to use this site you consent to the use of cookies on your device as described in our cookie policy unless you have disabled them. I noticed the apparent absene of a MAF sesor. Car runs better without MAF plugged in after VVTi single build. As airflow is measured from the MAP sensor, turbocharger variations will affect the fuel flow measurement resulting in higher or lower fuel flow. 8L (3800) vehicle without a scan tool. The ECU will Use default values and use RPM and other things to compensate. 8TSI with MAF it is running much rich and I have some missfires without MAF the car is significantly faster I dynoed with and without Maf and I have 243 BHP with 372nm with MAF and 239 BHP with 380nm without MAF and never had any missfire without MAF!!!. Even a dirty MAF sensor can cause a lean code and/or misfire to occur. The fast idle air then adds to this baseline amount of air to raise the idle speed. But if you clean your car's MAF sensor regularly, you can avoid that $300 repair and keep your engine running at top efficiency. Thats what I thought to myslef too. MAF sensor disconnected MAF circuit open to PCM. Carmakers like Ford and Chevrolet recommend that you replace the MAF sensor ($300) at that point. took a little while to figure it out but the maf was bad and caused the plugs to foul. The Mass Air Flow Sensor is often the likely culprit if your car isn't running as it should. Disconnecting MAP sensor (wiring) makes engine run great a big difference in the way the engine ran with or without the sensor connected. Next thing that could be causing the problem is the MAF sensor if its dirty, not functioning right, or if it has been descreened, there are some tests that can be run to see if its the maf, the other thing that can be causing the problem and most likely if you have a rough idle is the poppet's. It was then made of a tube, wire, and a bar magnet with cotton insulation. The following is included for information on the post 89 TPI:. These problems are similar to those caused by a faulty fuel pump. I can go 50mph without touching the gas peddle. at first it idle really bad. If you unplug the MAF sensor your car still runs. Generally located in the plastic housing between the engine and the air filter, the MAF sensor measures the volume and density of air entering the engine. Chain Guide Parts Diagram - 1990-1993 Q45. Without the MAF sensor plugged in the ECU has no idea how much air is going to the engine. I have witnessed this on another car; when MAF disconnected, the engine rpm increased slightly and increased rpm made the engine seemed as though it was running better. A clean MAF sensor is a happy MAF sensor. I realize that this is called Limp mode (owned an E320 a few years ago). [Query:] I have a 1985 740t with 244,000 miles and a m47 manual transmission. would make the car. Then i learned about the new Maf translator pro, which would allow the engine to run in speed density and get rid of a maf sensor completely. Additionally, since MAF sensors are somewhat pricey, many technicians are afraid to condemn them, fearing either the customer's or the boss' wrath if their diagnosis is not borne out. The authority was expected to choose one or the other but after technical data suggested that they would not reach legal compliance for nitrogen dioxide (NO2) for. Interpreting Generic OBD-II Scan Data. Can a Bad Sensor Prevent a Car From Starting? (MAF) sensor. 94 Lesabre 3. Often times a bad MAF will cause the engine to not start. You won't be able to last too long without a fully functional mass air flow sensor. Thanks for your replies no matter how ridiculus my questions may sound. one oxygen sensor; you. It can provide evidence for traffic accidents and ensure the safety of driving after installing it. Mass air flow hooked up car wont run unplug it car runs fine - Answered by a verified Mitsubishi Mechanic We use cookies to give you the best possible experience on our website. Seems my mileage is significantly up after cleaning the throttle body and MAF sensor which was the original objective. NOW CAR DIES EVERY TIME AT STOP. Check Engine Light Code P0100 Mass Air Flow (MAF) Sensor. TESTING THE MASS AIRFLOW SENSOR. MAF Sensor Info. I replaced the fuel filter, air filter, cleaned Throttle Body, checked vacuum system and EGR. Some people do not modify the airbox when fitting the CDTI kit onto a car running the 80mm MAF. Frequency table will need modification. com, the complete security AND surveillance industry guide provides extensive coverage of Shopping centre security. Thanks, you guys. Bookmark this page and share with friends having car troubles. This way, the computer can determine the amount of fuel that it would need to send to the engine cylinders to match the amount of air available. Then i learned about the new Maf translator pro, which would allow the engine to run in speed density and get rid of a maf sensor completely. Thanks, you guys. Bought a brand new sensor and it ran great for about 20 min and then started acting really weird. It is located in the front left of the car under a plastic cover. P0102 Mass Air Flow MAF Circuit Low Technical Description. today i decided to unplung my MAF. Therefore, in most modern vehicles a car can run just fine without a cat. The operating voltage range is 9 -7 Volt, and the output voltage of the mass air flow sensor (voltage to the DME control module) lies between O and 5 Volt. 96 volts, the sensor is functioning. This can harm overall driveability--and definitely hurt performance, as well as cause transmission problems and detonation. I wouldn't recommend doing it for a long period of time, especially if you do mods, but its just like having a car with no MAF and it runs in speed density like the 93 f-bodies did. Pedro is right about the crankshaft position sensor. Then I installed a billet spacer bought off Ebay. Just completed a single turbo conversion. When running the car without a thermostat, it runs at 50o C. Can be replaced with an aftermarket cold air intake kit if desired. Check the MAF reading at idle. 5% being the usual failure point. Cleaned MAF sensor and treated gas (thought I had some cheap gas). LATEST ADVICE The MAF is a sensitive and accurate device and is relied on to a great extent for the fuelling and Load calculations made by the EECV Powertrain Control Module (PCM). 7) Resulting AFR is measured by an Oxygen sensor in the exhaust manifold. Since I have already had a pinto engine in the car some of the steps have already been done. A car's engine uses an air intake in order to retrieve air from outside of the vehicle. Vehicle Speed -- Displays vehicle road speed as read by the vehicle speed sensor (VSS). waited about 30 minutes meanwhile i cut my dog's hair lol. Took car to indi BMW mechanic who claims to have: smoke test = no vacuum leaks; replace spark plugs (they had about 40k miles on them); clean ICV, clean injectors; swap MAF with strong running car and determines, since donor MAF does not fix idle, my MAF is not the problem. You will get a "check engine" light, but the system reverts to the "Speed Density" tune and runs fine. Negative values indicate that the engine is running too rich and oxygen sensor control is therefore making it more lean by reducing the amount of time that the injectors are open. Check for the correct voltage for the MAF sensor. everyone else:im hopeing its just something to do with a bad maf cause as soon as i hook one to is my SAFC read 5. Running with MAF unplugged, bad idea? with MAF plugged it it wont start without massive revs and even then wont start 9/10 times. 3 liter ford four cylinder. When you disconnect the sensor the car ignores the input and in some cases assigns a default value to the parameter. Once the problem is identified and fixed, clear and reset the codes again and drive the car some distance. alright im confused i just replaced the mass air flow sensor on my 03 f150 check engine lite was off for about 24 hours, is there anything else i need to look at all the codes that i had the guy at aoto store said they pointed to the mass air flow sensor. No codes with scanner the scanner jumps over the PCM pointer. I have witnessed this on another car; when MAF disconnected, the engine rpm increased slightly and increased rpm made the engine seemed as though it was running better. This would be the 4th I've replaced in the last 2. Does that mean the sensor is bad? from the research I did seems like that my MAF is the problem. Why is that?. Without MAF, monitoring of the airflow is very difficult, and so the chances of reproducibility of the desired performance in the field is much less. They thought they fixed it. The Mass Airflow Meter is an air flow sensor, also known as a MAF sensor, and is an integral component of the computer controlled engine system found What a Mass Airflow Meter Does and How to Maximize Your Car's Performance - CarsDirect. O2 SENSOR DIAGNOSIS. This is a lot less efficient than using the MAF sensor and thus runs less smoothly. The car sat for several years and probably had old gas in the tank. Maybe I will add some fuel injection cleaner also. I also have installed an external oil cooler, oil temperature gauge, and oil pressure gauge. this is what I've done to it. Mass Air Flow (MAF) sensor measures amount of air going into the engine. It will hit the shelves in late February, 2013 at a launch price of. Then i learned about the new Maf translator pro, which would allow the engine to run in speed density and get rid of a maf sensor completely. Took the car to the shop, that's where the crankshaft and camshaft sensors got replaced. The car was really lumpy when accelerating but once you got up to the chosen speed it would cruise without a problem. car was running perfect before hand. 7 l engine has a MAF sensor or is the system a speed density fuel injection system?. Without the MAF sensor plugged in the ECU has no idea how much air is going to the engine. Even did the fuel filter. The Dreaded Restricted Performance And The Road it Took Me Down. The windshield of a car, which is the primary display surface, is made up of an outer and an inner glass interface, they both receive HUD emissions and reflect them back to the driver’s eyes at. Tornado Discovery 2 Motronic Thor upgrade for use with larger MAF sensor Whilst the Motronic system will run a 4. If the car runs the same with it unplugged, you most likely have a bad MAF. The air mass information is necessary for the engine control unit (ECU) to balance and deliver the correct fuel mass to the engine. Is it ok to drive with it disconnected for the period of time it takes to get a replacement (days/couple of weeks) or will it cause problems?. I changed the MAF from my 2002 Crown Victoria that is running. Everyone did it). Still running strong after a couple days to / from work. Shop For Chevrolet with confidence. It's like it loses its memory that it's OK to run. All this happens without a glitch even when all we do is to steer the car in the intended direction. sir can you please tell me whcih part is that in the picture with red arrow sign? is it MAP? and actually i want to clean that part which was very dirty when i was cleaning TB. First, i will explain the function of the MAF. 6psi max boost. No more check. Check the MAF reading at idle. would make the car. Running without it would be not so good since you would be running super rich and eventually trash your O2 sensors. MAP + MAF (if there is one) + crank/cam position sensor are the most vital inputs to the computer. Thats what I thought to myslef too. What does that mean? This diagnostic trouble code (DTC) is a generic powertrain code, which means that it applies to OBD-II equipped vehicles that have a mass airflow sensor. Try to find a nearby member who will let you swap mafs and see how your car runs with a "new" maf. A mass air flow sensor functions as a gauge which measures, true to its name, the amount of air which flows into your car's engine. 8TSI with MAF it is running much rich and I have some missfires without MAF the car is significantly faster I dynoed with and without Maf and I have 243 BHP with 372nm with MAF and 239 BHP with 380nm without MAF and never had any missfire without MAF!!!. This can harm overall driveability--and definitely hurt performance, as well as cause transmission problems and detonation. It's job is to keep track of the amount of air coming in through the air filter, so that the ECU can adjust the amount of fuel getting into the engine. 6L with a manual transmission. All voltage and resistances. Check the measuring elements for damage. At this point the ECM relies on the MAP sensor as a backup. The stock mass air flow calibration is correct +-4% as long as nothing in the intake tract has been modified. properly if they would designed to run without. If your car jerks when you accelerate, it can be a sign of moisture or probably something wrong in its motors. I'm surprised the car even ran at all. Using a screwdriver, lightly tap on the sensor while the engine is running. If the car is stock and your other sensors are in good working order it really won't hurt anything. Get clamps with hose. The RW Takeaway: Very little has changed from Series 4, but runners will like being able to see their on-the-run data without lifting their arm. Vehicle options: Driver Air Bag;Passenger Air Bag;A/C;Security System;AM/FM Stereo;CD Player;ABS;4-Wheel Disc Brakes;Cruise Control;Rear Defrost;Child Safety Locks;Four Wheel Drive;V6 Cylinder. We apologize that this item is not available for pickup in store at this time. 8L (3800) vehicle without a scan tool. This is a discussion on Better idle with Mass Airflow Sensor unplugged within the General Help forums, part of the LSx Technical Help Section category; I have been chasing down an idle problem and decided to unplug the MAF to see if it would run. 5 liter engine will run poorly. Idle Air Control Valve :. Your correct that in Limp mode the ECU either opens the wastegate, DV or both to limit boost to safeguard components. Do you agree that i can drive with the Mass Air Flow Sensor in the car, but without the electrical connector hooked up? Can i drive 500 miles like this without ruining anything more on the car until i get the new one?. But anything else this means? I cleaned the MAF sensor with spray MAF cleaner and no change. If the car runs with a MAF code, tap the MAF while the engine is running and see if the engine bobbles or dies. If the car runs better you might think the problem is the MAF, but it could be the wiring. Please check before proceeding. The MAF provides a critical set of data to the computer for its calculations of proper engine. This indicates the power input to the sensor is correct. The strategy will determine things like whether a MAF or MAP sensor is used, how spark and fuel are calculated, how idle is controlled, etc. This will let it start and will run well enough to get to a service repair place. What the Home Mechanic Needs to Know About O2 Sensors - An Article from the OBDII Technical Library Today’s computerized engine control systems rely on inputs from a variety of sensors to regulate engine performance, emissions and other important functions. MA-05 2005 & Newer Ford MAF connector w/leads: Mass Air Flow Extension (2005 - Up): This is necessary when swapping or relocating the Mass Air Flow meter. When the 02 is plugged in, my car idles a little rough, runs rich, and has a slight "miss" to it. Find helpful customer reviews and review ratings for Hitachi MAF0047 Mass Air Flow Sensor at Amazon. The engine light only comes on when it stalls, then goes out. Conclusion: Your BD Turnkey Engine is going to run VERY good when you get it. Once you figure out which way you want to go with the MAF, you'll need to acquire a 2001+ air bridge and coupler. Hi, My car is really sluggish, so after a bit of reading up on here i disconnected the MAF sensor and it goes like a different car. A lot of cars have this. Car runs, however the #2 header tube don’t get warm. I recently broke my MAF sensor on my 1994 landcruiser. You get three sizes-small, medium and large. If I feather the gas I can keep it running but it is very rough (undrivable). It is located in the front left of the car under a plastic cover. in my experience, testing the resistance doesn't mean jack. This can be as easy as going strait from the Junkyard into your car, or spend a small fortune on a stock engine, it all depends on the owner and your goals, and how much you want to spend. 8L V6 Buick, Chevrolet, Oldsmobile, Pontiac 3. Or it could be your MAF! Since the engine runs perfect without it, it makes sense to conclude that the MAF is screwing it up when it is plugged in. Air changes its density with temperature and pressure. Do you agree that i can drive with the Mass Air Flow Sensor in the car, but without the electrical connector hooked up? Can i drive 500 miles like this without ruining anything more on the car until i get the new one?. The reason the car runs better without a MAF is because the ecu falls back to set values when sensors are unplugged. A MAF sensor on a General Motors 3800 V-6 is being tested for contamination. I pulled the code and was told I needed a new MAF sensor. MASS AIR FLOW SENSOR OPERATION: Check engine light faults relating to the Mass Air Flow Sensor are becoming less common, but do occur. It had to do with the maf sensor (mass flow sensor) which I changed and solved the problem. Boost levels above 12 psi should generally be avoided even with racing fuel on a 9. Vehicle runs better w/o MAF connected. However after a few days of driving (approx. Could also be the cam position sensor - the harness connector is easy to knock loose when working in the engine bay. Swapping the unit is a way to test this, but a bit hit or miss and expensive with it. You can find this tutorial in Spanish here: Cómo Probar El Sensor MAF (1. 8L V6 equipped cars. My favorite test for this problem is to use the tools I've got handy. By continuing to use this site you consent to the use of cookies on your device as described in our cookie policy unless you have disabled them. 8L Toyota Corolla) (at: autotecnico-online. Find helpful customer reviews and review ratings for Denso 197-6030 Mass Air Flow Sensor at Amazon. And of course after you are done with the maf table calibration to complete the tuning process you will need to set the high rpm disable back to 4,000 or wherever you would rather the ecu start to prefer the maf sensor over the map sensor and then you will want to turn back on the COT, DFCO, and PE. This is because the air escaping has already been measured by the MAF sensor. Conclusion: Your BD Turnkey Engine is going to run VERY good when you get it. The majority of emission test failures stem from a bad oxygen sensor. It's been stalling randomly at idle, then last Thursday started idling really rough and bucking. The MAF sensor has a ignition +12V power source, a ground and signal return. The reason the engine runs better with the MAF unplugged is because it is operating on the backup system; the Manifold Absolute Pressure (MAP) sensor. A bad mass air flow sensor in a vehicle makes starting difficult and affects the performance of the engine because he engine-control unit uses data from the MAF sensor to balance the fuel ratio the injectors deliver to the engine. There are various designs of MAF sensors, but the most common by far is the hot wire MAF sensor. If an O2 sensor is not functioning, your car is winging it and might run horribly or not at all. hey guys, sorry i havent been around. A coolant sensor that always indicates a cold engine will also keep the system in open loop, which means a steady diet of excess fuel. One of the guys pulled the maf sensor off and pulled the pcv valve out, stuck his thumb on the hole and the car ran fine. Cleaned MAF sensor and treated gas (thought I had some cheap gas). I had to do this for about 10 miles today and it did run with no issues except the check engine light came on. It’s a part of the engine-management system, so your car wouldn’t be able to adjust to changes in altitude without it. Your computer need the MAF to compensate the fuel mixture for air density and if you have a lead after the MAF in your intake piping after the MAF your car runs like poo and goes like stink. Ummmm, you have a leak in the intake piping after the MAF. Testing the Ford mass air flow (MAF) sensor on all of the Ford, Lincoln and Mercury cars and trucks is a very simple test that can be done without a scan tool. 7 l engine has a MAF sensor or is the system a speed density fuel injection system?. Check the MAF reading at idle. Why is that?. Mitchell1(R) obtains wiring diagrams and technical service bulletins, containing wiring diagram changes, from the domestic and import manufacturers. Then I sprayed the cleaning agent on the MAF wires and let it dry, then put it back together. From then to now there have been many advancements in the generator technology. Since Hay esdoes not have a repair manual out on the 2011 thru 2013 Dodge Charger and since the tech rep at Summit racing could not help me I am askin if any one knows if the 5. So my thinking is that the missing signal from the MAF is keeping the ECU from using input from the actual failing sensor, ll. The PCM uses this information, along with information from other sensors, to control fuel injector on-time and achieve the correct air/fuel mixture. 1990-1992 TPI cars switched over to a MAP system (also referred to as Speed Density) where the ECM gets a estimated air flow based on engine vacuum. All you need is a multimeter. Just be alert for these common symptoms: 1. Q: My dashboard Check Engine light came on and a scan tool said Code P0171 was stored on my car's computer. MAF: This code is set when the ecm sees a indicated airflow of greater than 45 grams per sec (gps) and the tps is less than idle, and engine rpm's is around 2000. The oil pressure. The reason the car runs better without a MAF is because the ecu falls back to set values when sensors are unplugged. If an oxygen sensor is switching slowly, or sticking at a value, then there is a gross failure in the fuel control system (MAF, engine coolant temperature sensor, Oxygen sensor, etc. All intake air must flow through the sensor. It could be on the throttle body attached right to the intake manifold. How does a Mass Air Flow Sensor (MAF) work? A brief background on what a MAF does. The first step in diagnosing a faulty MAF sensor is to perform my favorite test—the tap test. Some mechanics will recommend to clean the sensor every time you replace the air filter. Try that before you spend money on a new one. If all else fails, remove and replace the MAF sensor. Portable breathalyzers run anywhere from $50 to a couple hundred - but are they worth it? FOX 2 and Allen Park police teamed up for a study including five people drinking alcohol to test the. It's biased positive, possibly by a partial short circuit between the sensor line and the heater feed. (it's a kind of non-invasive EGR blanking) TD5 MAF Sensor Theme. First, NEVER use MAF cleaner with the engine running or even with the key in the run position.