You are correct in saying that the ecu will not take long to learn character of new Maf, in fact the value from the unit is a fixed one ie a particular value = a certain mass air flow, but what the ecu will do is learn throttle position and engine speed etc. Have all torque management and abuse turned off. So I unplugged it. I then suspected the MAF and unplugged it and it would star and run reliably. I already unplugged it and it runs great so i am just curious. What does the MAF actually do? Discuss problems you have had or are having with your Z4. So, I replaced the MAF, with a used one, and plugged it in. Obviously, the MAF meters the amount of air flowing into your intake and sends that information to the computer, which then calculates fuel needed to meet that magical 14. Difficult to road test to confirm fault in gear but owner states it does it on the road. At this point the ECM relies on the MAP sensor as a backup. Engine still running, unplugged right. Successful MAF Sensor Diagnosis. Ran fine for a couple drives, now car will not start. Routine maintenance helps assure that a car is running properly and proves more reliable over the course of ownership. With the MAF unplugged and the chip in, the car runs worse. Unplugging the MAF sets the car to run in a sort of "safety tune". The most reliable early symptom of a failing or failed MAF is the illumination of the check engine light on the instrument panel. right now the car is only running on 4 cylinders we have found out, we unplugged 4 injectors (cylinders 2, 4, 3, and 7) and the car runs the exact same, next i will swap the injectors that are clearly working properly to the spots that arent working to see if it changes. so it mustve been broken). Is it my throttle body or TPS, perhaps a bad PCM. MAF would most likely throw a code. Jay Safford. The car ran a little better after that but not a lot. Comments: hi , i have a bmw 318is 1998. I reflashed the car with the rev v2 map and exhibited the same problem. 100 ps more with 7 psi. So this leaves the possibility of an injector fault or a vacuum leak specifically on that cylinder or internal problem causing misfire. I can honestly say i get 32 mpg highway and 28 in city. In the last week I was running a full tank of high octane gasoline + aditive for injectors. Running with MAF unplugged, bad idea? MAF unplugged it runs fine. When the MAF sensor goes bad, the computer sets a trouble code and illuminates the Check Engine light. If the MAF is BAD (either because it's not producing a signal or producing an erratic one), the car's idle will return to normal and the car will seem to run fine. If after all of that you don’t see an increase over 4v on the meter, that MAF is certainly bad. So I tried something new with my MAF's to figure out if they are working properly. Based on some recommendations I read, I unplugged both POS and NEG terminals and touched them together for about 10 mins. Put a new set it did the same thing ran like crap. What does the MAF actually do? Discuss problems you have had or are having with your Z4. One of my friends clean the whole throttle body and the car started running fine. Driving around with MAF disconnected! car runs like night and day. The 'check engine' light is on, but it's been on for a while now, not necessarily because of me disconnecting the MAF sensor. Unplugged the MAF while running and the car doesn't run any different at all with the MAF unplugged, it still runs the EXACT same with the MAF unplugged it just wont rev past 2500rpm. It would crank start and then die. My common sense would say it's a bad 02 sensor, but I'm a novice at tuning these. The largest 4Runner community in the world. Re: Disconnecting MAP sensor (wiring) makes engine run great I hate to suggest parts tossing vs testing out to be certain. The last time I tried that test, it seemed to run better with the MAF disconnected, so I replaced the MAF (new Bosch part). Because the box comes from a car that runs 70mm pipes it only has a 70mm outlet. 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. If one unplugs the MAF, the ECU goes into the default mode and sets the mg/str at 550. If the engine stumbles or stalls, the sensor is faulty. i've got a spare in my toolbox after this experience. Of course, there are many other reasons why your car might not be running properly, so today we're going to explain how to diagnose a bad or failing air flow meter and see what's involved in fixing it. It turns over, idles ROUGH and then dies. the car runs smoother through the rev range, and fuel economy is the same or better. However, the problem is that a stock sensor uses the intake air temp input to the ECU for its own purpose. 4% "reading stays the same at 1221 rpm timing advance: 5 degrees O2 sensors bank 1 and 2: 1. I've unplugged the MAF and checked again, which seems to make it start at a base value of 500mg/stroke increasing with rpm and it now runs much better than it did before. 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. Only the intake boot and box are side specific. The 'check engine' light is on, but it's been on for a while now, not necessarily because of me disconnecting the MAF sensor. Car runs better without MAF plugged in after VVTi single build. Top Rated Plus Same day or Next. When i unplugged the MAF the car pulled way better and more like it supposed to be. Agreed with fella who plugged it in that it must the MAF, so I bought a new one from Ford, I fitted tonight, and now its doing the exact same, with the MAF plugged in. 6L Tech' started by Aesthetics28, Jun 5, 2015. And at this moment, we are concerned about two of the most frequently happened incidents of cars. Car runs same with WUR unplugged? I think I understand what WUR does. Look through it, and see if any of the holes in the air straightener are munged. I cleared the codes and the only remaining ones that came back were the MAF code and I am without traction. I don't have the wiring diagrams to see if there are any other sensors in the same part of the wiring or allowing me to do wiring checks. Have diagnosed many MAF issues like this over the years and has always worked for me. Then I sprayed the cleaning agent on the MAF wires and let it dry, then put it back together. Car runs lean with maf plugged in / perfect when unplugged Discussion in '2005+ Mustang GT 4. Air flow mass meter corsa unplugged. I did some research and find out that dirty fuel filter and/or MAF. I unplugged my MAP sensor to see if it would drive any better it did not so I pulled over and plugged it back in with the car running as soon as I plugged it in the car shut off. Check Eng ine Light The most reliable early symptom of a failing or failed MAF is the illumination of the check engine light on the instrument panel. stomp test again and same ol' 1213. Running on a stock Mitsubishi MAF sensor is a great idea for dialing in SD because it tends to produce a very accurate signal. 30 seconds after I plug the chip back in the idle goes crazy and the rpms jump up, then down etc etc and the CEL goes on and off a few times every couple of minutes. 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. And what's the difference between how it's running with unplugged MAF and the chinese one cos if it runs better or the same with MAF unplugged then IMO even the $30 is wasted money. My car has 90000 miles. Running with MAF unplugged, bad idea? MAF unplugged it runs fine. it missed under heavy acceleration. If you unplug the mass air flow sensor the car will start. After several repairs the car has been running rough (see long explanation below). With the MAF unplugged and the chip in, the car runs worse. if it doenst work, im doing the optispark and hoping for the best. I've tried running the car with the knock sensors unplugged, and both lambda sensors unplugged. Naylz Newbie Posts: 44 Joined: Mon Mar 11, 2019 9. I have noticed whilst the MAF is unplugged, I have three fault codes:- P0100 Air flow meter short circuit to ground or open load (as expected). I have that same problem 2000 328I sedan but unplugged it runs fine but burns more gas! when plugged im afraid it cuts out because at stand stills the car rattles horribly im currently driving the car with the sensor unplugged. The MAF sensor appears to be sending values back to the ECU, but the car stays in limp mode even after a reset. 6L engine and automatic transmission. If you're running a MAF translator, you should select the option below specifically for GM with MAFT. If there is 12 volts there with ignition on it means something wrong with my ECU. i've got a spare in my toolbox after this experience. it missed under heavy acceleration. She did say that the car felt more responsive with better fuel consumption after I installed the new MAF. That brings up the question of can your car run without the mass air flow sensor? In this article, we will look at what happens when you disconnect the mass airflow sensor. Loss of power while HOT. I, like many here, noticed a very faint stutter between 2-3K RPM that eventually became more noticeable recently. Just a low idle and surging if in park (limp mode). To test it just disconnect the wire going to it and drive around for a few days. Sorry If im beating this one to death, but what is really so bad about drifing with your MAF unplugged? my Bosch MAF is Kaput, and I unplugged it about two months ago with the full intention of buying a PB Maf but It seems very hard to justify buying one when the car drives sweet without it. The above mentions the ECU running on a default setting. Dtc code for 0101, 0102 and 0103 have ses light off and set to mil on first. Successful MAF Sensor Diagnosis. I have monitored the g/s intake flow of air and at idle it's 19-22 g/s and at full throttle the reading is about 70-80 g/s. One is the car losing water and other is the engines overheating problems. Those things never burn out, just like the AB light!! Years ago I had a Ford Taurus that I bought as salvage (someone hit a deer with it and the passenger AB went off) put it together and drove it for the work car. Have a friend with e46 318i, and her MAF started acting up. Print the modulo clock resource with modulo 10 out for the students, or draw it on the board (This sequence of questions could also be run using the train or ferris wheel model; see the next section). It's not bad for your truck to run without the maf but you'll be getting terrible gas mileage. Plug it back in and it spits and sputters. If thats the case, then the MAF is bad; replace it. A MAF (mass air flow) sensor is famous for causing such a problem. level 1 Beli_3636. the result is i need a extra gear (6 speed. But it halfway runs without the MAF plugged in. It sounds like ur problem is c, check for leaks in intake track (intake tube, throttle body gaskets and connections etc. Best to sort out the problem or you are just giving up power and mileage for nothing. AIP Electronics Premium Mass Air Flow Sensor MAF AFM Compatible Replacement For 1998-2003 Nissan Infiniti Mercury 3. But I actually haven't tried again with the MAF off, to see if the P2187 will return, if the MAF is disconnected. So I decided to unplug my iac and tps sensors to see if there was a change in idle with my car. When the MAF sensor is plugged in I get two P0300 ses and car hesitates and has power loss and according to my "mechanic" friend the exhaust note sounds like the timing is off. However, the drifting idle tends to make me want to look for vacuum leaks and check the rear temperature sensor on the driver side of the head. Like 3 weeks ago my car wouldn't go after 2000 rpms this happened after I washed my car. I haven't ruled out the MAF but a simple test and a bit of logic (although it may be incorrect) makes me think that the MAF is fine. If you just experience a rough idle (or something like that) but the car is running fine while driving, it isn't likely that your MAF is shot, even when you measure 1,4 volt at #3. Last week while out-and-about I decided to stop the car, leave it running, pop the hood, and try the "unplug the MAF" maneuver that had been described in several forum posts. I could get it started again but had same issue of not wanting to stay running. Same problem I had before. It must have been pulling it's air fRom there and causing the maf not to get any air flow. Alternator and battery test fine. Running Car with MAF unplugged TDI 101. Another way to test if the MAF readings are messed up is to simply unplug it. they are different part numbers but should get you up and running. Maf unplugged it runs better but I suspect that is because going into limp mode. The car doesn't has the "check engine" or cel light on. just because its bad doesnt mean it will set a code. I thought MAF was at fault so I replaced it but same thing, going full rich when plugged in and going to -30% when unplugged. Car ran fine with the maf disconnected. Anyone else having this issue?. hi nick i have a plenum mounted on the ITB's and the MAF sensor hooked up and the TPS hooked up on the ITB's but the engine check light stays on because the second TPS for the electronic throttle flyby wire is unplugged as its not needed anymorebut when i plug the flyby wire up the check light goes away. Not really missing, just kills if the MAF is plugged in and definitely doesn't do low speeds well without stumbling and killing. No "jerkiness" or idling problem. Don't just unplug the MAF. There's a rubber "o-ring" that's not an "O" so don't go looking for a gasket thinking you lost it. Re: Car stall when MAF plugged in? '98 V70 Post by erikv11 » 05 Jul 2017, 04:54 If you test it the way abscate describes, and it runs better unplugged, the problem is either a bad MAF (most usually) or unmetered air getting in after the MAF (sometimes). A common test for a failed or seriously degraded MAF is to do just this, and if the car runs better with the MAF unplugged, it's badly fouled. So my question is: Until a new MAF arrives, what do I do? plug it back in or drive with it disconnected? I don't wan to hurt the cats, but it's obviously not working properly and runs better when unplugged. If it does, probably it is bad. You won't do any damage as the ECU will run a default map. I unplugged my maf the other day to spray maf cleaner on it. Chevy didn't elaborate on how the added weight affects performance, but we'd imagine that it accelerates one or two tenths of a second slower during a 60-mph sprint—even thought it runs the same. One way to test the MAF is to let the car get to its full idle speed (in your case 1000 rpm) then give it a quick tap with the handle of a screwdriver. After I plugged the tps back in the check engine light came on, I pulled the code and it was tps 1022 I believe. I've cleaned the wires with MAF cleaner and checked the output signal on the sensor previously when the problem was intermittent, and it was normal. My car has an automatic transmission. Power is pretty much gone. It runs a predefined map from the ECU. My common sense would say it's a bad 02 sensor, but I'm a novice at tuning these. You could try a can of MAF cleaner which is only like $7-8 & if that doesn't work you might want to look into replacing it. The above mentions the ECU running on a default setting. Car runs lean with maf plugged in / perfect when unplugged Discussion in '2005+ Mustang GT 4. If I unplug the MAF car starts and runs smoothly. Obviously, the MAF meters the amount of air flowing into your intake and sends that information to the computer, which then calculates fuel needed to meet that magical 14. If the car runs normally then you have a dodgy MAF. Hi I have fitted an Egr blanking plate today and the car seems more responsive lower down but it's still slow after say 2000rpm as though the turbo not having any effect (definitely slower to pick up than the C4 1. With MAF's plugged in, car idles rough and is very lazy. MAF would most likely throw a code. The car is a 2004 Renault Kangoo fitted with a 16v 1. The car drives fine for the first couple minutes (accelerates normally) and then reverts back to its previous behavior of hesitating after each shift. They ended up having the same issue I had. If the car stays running and does not cut off but will not let you rev over 4K it is 100% the MAF. not bad for this light car. If the maf is bad and the car runs bad then when you unplug the maf the car will run better you will pretty much notice no change if the maf is bad and then you unplug it. I then tried starting the truck with the maf plugged in , but out of housing. Cleaning the MAF sensor on a Corolla According to some Toyota forums, cleaning Mass Air Flow (MAF) Sensor can fix low idling. Relays: As you can imagine, you will need relays to get your car running. 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. A bad mass airflow sensor causes the engine computer to lose the ability to calculate the appropriate amount of fuel to inject. I did find some chopped up wires, one being the MAF wire Green/black. Unplugged the car starts up and stays running. installed last night, DID NOT unplug MAF, worked fine this morning, no CEL Tonight, i decide to use the MAF cleaner (it was late last night, figured id clean it today)- unplugged like the directions said, sprayed it down with the cleaner, let sit for an hour or more- it seemed to dry really fast. Obviously, the MAF meters the amount of air flowing into your intake and sends that information to the computer, which then calculates fuel needed to meet that magical 14. i thought the MAF was bad prior to replacing it since when i unplugged it the car ran perfect. P0101 - Which is Mass airflow sensor (MAF) P0113 - Which is the intake air temp sensor. The car parking ticket expires at 1am (1:00). But if you clean your car’s MAF sensor regularly, you can avoid that $300 repair and keep your engine running at top efficiency. If there was a vacum leak it would throw a code. Air flow mass meter corsa unplugged. The only codes that my laptop pulled was esc. This is a story of my experiences with the oxygen sensor in my car. 6 hdi 110- same engine) I have tried with the maf unplugged and I can't tell a great difference, but it's certainly not worse?. Plugged in it idles really rough and stalls if you try to rev it. With the MAF unplugged you will get the engine light and code pop up and the car will not run 100% right. I pull apart the fuel filter, the IAC and all are in good order. Car runs better without MAF plugged in after VVTi single build. Better idle with Mass Airflow Sensor unplugged. If you run the car with the MAF unhooked & it runs better than with it hooked up, that's probably the issue. •There could be a vacuum leak downstream of the MAF sensor. 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. This article applies to the Chevrolet Silverado 1500 (2007-2013). If the car runs normally then you have a dodgy MAF. Still no CEL. Unplug MAF, and the car idles and runs just fine. 2) When I unplug the MAF sensor, the engines starts and runs, it even idles. running a GM MAF through a MAF translator. plugged the MAF back in and the CEL stayed on, even after restarting the car. If the idle changes, the MAF is not happy. The above mentions the ECU running on a default setting. I have a 1995 mustang, 5 speed, 3. MAF Systems are the worst: If you have a car with a Mass Air Flow sensor (looking at you, General Motors) these wastes of money are the worst thing you can do for your car. Installed new fuel injectors. car runs better it is knackered runs worse its ok but if there is no change? if unplugging the maf. vvti engines run off MAF sensor. well i replaced the MAF and the car still runs like crap: stuttering a little bit while accelerating, not idyling well. This week on The Best of Car Talk, Tom and Ray stray ever further into terra incognita, as they try to help Sharon figure out why her hair looks lousy after a long drive. When the 02 is plugged in, my car idles a little rough, runs rich, and has a slight "miss" to it. 275 volts @ 0. Hi I have fitted an Egr blanking plate today and the car seems more responsive lower down but it's still slow after say 2000rpm as though the turbo not having any effect (definitely slower to pick up than the C4 1. For now, I left it unplugged and drove around the block this evening. Car would barely run with the MAF plugged in. I don't have the wiring diagrams to see if there are any other sensors in the same part of the wiring or allowing me to do wiring checks. Same problem I had before. Then I sprayed the cleaning agent on the MAF wires and let it dry, then put it back together. Driving around with MAF disconnected! car runs like night and day. 9 - No Power at low revs. Sometimes we experience an annoying hesitation or stalling when we are cruising in our cars and decide to accelerate either slightly or harder. If you notice that your car’s engine drags when an extra load is added, it may be due to a faulty MAF sensor. MAF does look slightly dirty so I'm going to grab some MAF cleaner and try to clean it to see if it makes a difference but I also have about 3 CELs. It will probably throw a code but if the issues you speak of do not happen with it unplugged, then I would say the MAF most likely is the problem. Sometimes wont start at all. Bad MAF = terrible fuel / air mixture so the engine just dumps WAY more fuel into the engine than it needs so it just misfires. I bought this when I found that my car ran infinitely better with the MAF unplugged. when a vehicle comes in thats running poorly or has stumble when acclerating, after checking basic fuel pressures and spark KV. The wierd part: it runs and idles fine if the MAF is unplugged it will idle all day with the MAF unplugged Anyone ever have this problem?. the car runs fine untill it reachs normal running temp. Get the best deals on Car & Truck Air Intake & Fuel Delivery Sensors when you Mass Air Flow Sensor Meter For BMW 325 323 328 528 525 E46 3 Series 325i 99-06. 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. The turbo works perfectly. Hurray, is not the turbo! The MAF is broke. If you run the car with the MAF unhooked & it runs better than with it hooked up, that's probably the issue. When replacing Maf did not work, i started replacing other parts, main relay, ignition and engine control modules, camshaft position sensor, pulse sensor, i checked al the wiring for corroded connectors or damaged cables, found none. 1 suspect, no difference. As soon as I plug the maf in it sputters and then eventually turns off. car was running perfect before hand. same results. Anyone else having this issue?. 24 month 40,000km part replacement warranty. It stalls and I can smell unburnt fuel in the exhaust. Now open or close the air bleed screw (CCW opens) next to the IAC until the car idles at 575 to 600 rpm. So I cleaned the MAF with some multi-purpose auto parts cleaner. well i replaced the MAF and the car still runs like crap: stuttering a little bit while accelerating, not idyling well. If you run the car with the MAF unhooked & it runs better than with it hooked up, that's probably the issue. Car seems to drive ok without the MAF, but I haven't driven it far yet. 0T CPs and am running proper NGK spark plugs gapped at. As a model year progresses other variables, like part lot numbers and such can cause one car to run much better than the next. When it is unplugged, the ecu runs off of default maps for fuel and timing. 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. Crosswalk at intersection where child was hit by car and killed won’t be re-installed old in stroller killed in North County hit-and-run. If you're running a MAF translator, you should select the option below specifically for GM with MAFT. 0 Truck starts right up - Hot Or Cold. With it disconnected, the ecu gives a false reading to get it going, albeit roughly. Same problem I had before. no CEL, but the car still ran like crap and wouldn't acclerate. I think the MAF got messed up or somthing because when I dropped in the GTX injectors it was doing the same thing, wouldnt idel and just die. it was a bitch to get it to run with out pedal pushen' but it ran on its own 1221 rpms. 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. If you did unplugged your MAF and your car runs fine when you unplugged it then yes you have a faulty MAF. I repaired the wire and it still doesnt work. if its still operating withing its Hertz and grams per second perameters it will not set a code. But it's better then running on the bad idle because you're misfiring which isn't good for the engine. If the car runs normally then you have a dodgy MAF. maf screens and air straighteners. If there was a vacum leak it would throw a code. I've read that if your runs perfectly with it. bought a new MAF (they call it a Air meter) which comes with the new housing , screens and sensor for 83 bucks cdn. If I unplug it, the car runs well and my readings for long term fuel trims go back down. Something came unplugged in my Mercedes C240? Mercedes C-Class Forum. I have torque and also some of the PIDs from Prius. I do not think those values are manipulated with the custom tune, so with larger injectors and larger MAF housing, the car no longer has a known good value to fall back on. 1999 - 2003 7. Show Full Signature 04 QSM M6: LQ4 Forged 408, 12. They ended up having the same issue I had. I've unplugged the MAF and checked again, which seems to make it start at a base value of 500mg/stroke increasing with rpm and it now runs much better than it did before. on live data at tickover mv on sensor is staying around the 850-900 mark , as soon as you touch throttle even a tiny bit the sensor mv are up and down like a yo yo. I unplugged it and she started up and ran fine. No change in the engine idle while it was unplugged. Same problem I had before. runs extremely rough for 5seconds before dying with it plugged in and runs extremely rough with it unplugged for 30-45seconds before dying. there is no power at all with the car no errors at all so started doing some tests and unplugged General: MAF unpluged advice - The FIAT Forum. At about 85,000 miles my Corolla's idle speed decreased from 700 to about 500rpm and felt like it was going to stall sometimes after the AC compressor kicked off. It MUST be clean of debris and the state wire MUST not be damaged ( for example: K&N filter oil can cause your symptoms) If it's unplugged, the engine runs well but when plugged in the engine will not run at all. Runs fine with mass air unplugged. Still no CEL. It starts - coughs and splutters and then stalls, but then unplugged - it starts and runs but with no turbo or boost pressure, and ESP system fault on the dash. quick question: if my maf is the cause, and I unplug it, how should my car run ?. 2002 Mitsubishi Lancer runs better without the mass air flow plugged in. One will by 5 volts, which powers the device and is supplied by the ECU. Example: Let's say the engine is running at 2100 RPM at any particular time. The car is a '97 Merc E200. I've tried with both old filter and old plugs installed vs new, the one variable between it working and not is the MAF being. To test it just disconnect the wire going to it and drive around for a few days. i am running with all stock,beside the maf converter (apex). It would put the car in limp mode and flash the traction control lights but at least its driveable now. The car drives fine for the first couple minutes (accelerates normally) and then reverts back to its previous behavior of hesitating after each shift. on cars with both map and maf the pcm will also use the map sensor to check the egr and other rationality checks. plus woud your high oil consumption indicate it may not run totally smooth?. My question is, can I just leave the O2 sensor unplugged, or does that make it run too rich and it's not good for. It may run shitty but should not shut off. My first thought was a bad MAF but the more i read i see that it could be a few other things. After I plugged the tps back in the check engine light came on, I pulled the code and it was tps 1022 I believe. Crosswalk at intersection where child was hit by car and killed won’t be re-installed old in stroller killed in North County hit-and-run. Had some failing MAF symptoms so I decided to unplug it to test the car's response after cleaning it with no noticeable change. Generally speaking, if a car runs better with the mass airflow sensor unplugged than with it plugged in, the mass airflow sensor has failed. The light went off after I pulled the code. I didn't run on LPG during the last days. I ran the codes and there was the same MAF code along with a few cylinder misfired codes. The ecm will calculate the amount of fuel needed depending on the signal from the MAF sensor. Then it went full rich with black smoke on the first maf. if you uplug the MAF and problem goes away then you have a bad MAF sensor. 1 suspect, no difference. The only thing it accomplishes is to set another code. Look through it, and see if any of the holes in the air straightener are munged. I thought you would like to know. I just let it run like that for a while. on live data at tickover mv on sensor is staying around the 850-900 mark , as soon as you touch throttle even a tiny bit the sensor mv are up and down like a yo yo. Your car has a lot of sensors, and this is just one that helps your car run properly. WOW what a difference , she runs like new. One will by 5 volts, which powers the device and is supplied by the ECU. The ECM will run off the numbers that are set in the prom. took a little while to figure it out but the maf was bad and caused the plugs to foul. If one of the tiny metal heated resistors is broken, that affects fuel mixtures. Signs Of A Failing Mass Air Flow Sensor Your Mass Air Flow Sensor (MAF Sensor) is a piece of technology within your engine which tells your car's computer how much air is entering the engine. right now the car is only running on 4 cylinders we have found out, we unplugged 4 injectors (cylinders 2, 4, 3, and 7) and the car runs the exact same, next i will swap the injectors that are clearly working properly to the spots that arent working to see if it changes. 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 one O2 sensor on a high-mileage vehicle has failed, chances are the other O2 sensors may also be nearing the end of their service life and should be replaced at the same time to restore like-new performance. From what I've read, the car is supposed to run after you disconnect it so my question is, what does it mean if the car stalls when disconnecting it?. Each time this occurs I clear the fault code and it never comes back. Check your intake hoses for cracks before replacing the MASS AIR FLOW SENSOR. Just completed a single turbo conversion. My MAF is on the blink so it has been unplugged. One day i snatched second gear waayyy too hard and the motor rocked and snatched the maf plug out and the car cut off. installed last night, DID NOT unplug MAF, worked fine this morning, no CEL Tonight, i decide to use the MAF cleaner (it was late last night, figured id clean it today)- unplugged like the directions said, sprayed it down with the cleaner, let sit for an hour or more- it seemed to dry really fast. It would put the car in limp mode and flash the traction control lights but at least its driveable now. It’s that easy! Now You Know How To Clean A Mass Air Flow Sensor! Knowing how to clean a mass air flow sensor can save you money and keep your engine running at its peak. One way to test the MAF is to let the car get to its full idle speed (in your case 1000 rpm) then give it a quick tap with the handle of a screwdriver. If you notice that your car’s engine drags when an extra load is added, it may be due to a faulty MAF sensor. He touches the air filter box and its hot, while the intake is cool.