If you have a car that only runs with the mass airflow (MAF) sensor unplugged, there are a few potential causes. So, now you know what happens when you disconnect the mass airflow sensor. 1999 S52 Estoril M Coupe. 8) Air pump Right side firewall in the corner is running. Okay then, maybe I am just now hearing it from the new bellows. I probably don't know. If the air filter is dirty, it will need to be replaced. What happens if you unplug maf sensor. My car has an automatic transmission. Everything was in place and this thing should have ran. I would deal with IAC first, then probably with precat o2 sensor connection and after that with ignition coil (you can try to switch the coils) if there are still errors.
I rechecked everything. P1250 has as much crap floating around as unplugging the maf. 9) I let the engine get up to running temperature.... Car Only Runs With MAF Unplugged? [Explained. seems to idle a little rough then. That is because the numbers the computer generates are for brand new engines, and conditions change with the engine as it ages. In your case, when unplugging the mass air flow sensor, your car's engine is bypassing the mass air flow sensor input into the ECU causing it not to have a reference point for air/fuel mixture. You also have a vacuum bung rubber thingy from the IACV to the intake manifold'a underside (IACV must be removed for you to see it). I am willing to do it all to achieve the wanted end result.. A great running and even better looking roadster.
That brings up the question of can your car run without the mass air flow sensor? This can cause the engine to run lean (too much air and not enough fuel) or rich (too much fuel and not enough air). If the intake boot was cracked, you have plenty more hoses that can be in a similar state. Also, if the computer isn't the issue, then it means one of the other sensors is probably off if the car isn't able to keep running without the mass airflow sensor because the sensor was helping the car compensate for the other issues that it was having. But I am pretty good with cars and I am a quick learner. Buttoned every thing up, refilled and bled the coolant system... (side note, I think it's ridiculous to have to use distilled water with the BMW coolant! I went to start the car and it fired up and I guess it decided it didn't appreciate what had just transpired and then promptly died while making this odd whistling noise. Now I have the Peake Scanner and it shows some codes even though my China scanner was used to clear before. One way is to bang it with a screwdriver head to see if the idle changes or the engine stumbles, but you can still have a MAF out of calibration that could cause a lean or rich mixture. Hi guys; Here is where I am at so far: This is a 2000 2. What would happen if MAF sensor was unplugged. However, doing so is not recommended for a few reasons.
It is not revving properties. 98:precat o2 sens disconnected cyl #1-3. Your car has a lot of sensors, and this is just one that helps your car run properly. So while you can technically drive with an unplugged mass airflow sensor, it's not something we would recommend. A mass airflow sensor (MAF) is a key component of an engine's electronic control system. Now on the engine I can hear what sounds a little like a pc fan under the intake manifold when in the run position, Is that normal? As far as vacuum leaks and the sensor Airbag sensor, as soon as the Amazon delivers my stuff I will check. Car won't run with maf plugged in videos. Last but certainly not least the car came with a bent rear rrently being straightened at the shop. They ended up having the same issue I had.
Please don't think I already now about issues which may be common to BMW.. This is what causes the hesitation or loss of power you describe. First, without a mass airflow sensor, your engine will not be able to properly regulate the air/fuel mixture. PD won't run with MAF unplugged. After having the car for a week and a half and throwing another $1500+ in parts at it, they finally told me that the car would only run with the MAF unplugged and that the only thing left for them to try was to replace the ECU which would cost me an additional $2300 plus shop time. If there's a vacuum leak under the intake manifold, you'll have a lot of trouble seeing it, especially of you're lying and actually have a Ford Escape with the V6 and you can't see anything under it. All genuine MINI parts), put the car in maintenance mode and went to town. I can get some readings live on this obd II scanner and the maf does read when plugged in (what should it read?
Kept the engine turning for a good 10 seconds, gave it some gas and slowly came to life. This is because it will help you get the best gas mileage possible. Here is a P1250 code translation: These cars are up and running closed loop, using the O2 sensors as feed back to trim the MAF reading, within 30 seconds of cold start. There is no one magic number, if there was the maf wouldn't be needed. Now Pretty much the same situation. Many believe unplugging the MAF simply takes the MAF out of the calculations. There is still no CEL/SES light on, so I don't know if these codes just weren't "really erased" or if they are part of the current issue.
Additionally, unplugging the MAF sensor can cause the engine to run richer because it isn't getting accurate information about the amount of air flowing into the engine. I tried starting 2 more times, giving a bit of acceleration on the last attempt and still nothing. If you want a technical definition of how a mass airflow sensor works, then you can take a look at the article we have here, but for this article, we will just cover the basic function of the mass airflow sensor. When you reach operating temperature, the ECM switches to the O2 sensor readings, which give better control because the computer can analyze how the engine is actually using fuel and can alter fuel trims to optimize drivability and efficiency. Whe you unplug the MAF, the system is forced to run an Alpha-N map.
How do I fix a car that only runs when the MAF is unplugged? So, since the mass airflow sensor is used to measure air intake into the engine to keep the car running correctly, then what will happen if you unplug the sensor? Additionally, driving without a mass airflow sensor can trigger the check engine light. To me, the whistle and the fact that the car only runs with the MAF unplugged indicates a vacuum leak somewhere. This can also cause the engine to struggle to idle for the same reason. Finally, there could be an issue with the engine computer. If the computer is not able to properly adjust the air/fuel mixture, it could cause the engine to run only when the MAF sensor is unplugged. On the vacuum I haven't seen or heard anything else yet, but I am looking into that. This can lead to decreased fuel efficiency and potentially damage your engine.
Can you test a mass airflow sensor by unplugging it? Reason: Added information. I was driving my R56 one day and I got an engine temp warning. Has brand new maf sensor. Before going into detail on what will happen when you disconnect the mass airflow sensor it is important to understand what it actually does. With the maf unplugged, the car hauls ass. If the car dies when you disconnect the mass airflow sensor, then that means it was working right and that your computer has issues. Again is that normal??? 2003 VW Jetta TDI Manual 47-50mpg. If the sensor is working properly, the voltage drop should be within a certain range. Look, this car is 10 years old and now we're bordering on repair prices that outweigh the current value of the damned thing. Is it bad to drive a car with the MAF unplugged? Edited April 3, 2018 by Multisurface-Legacy 1 Quote Link to comment Share on other sites More sharing options... On top of testing the mass airflow sensor by disconnecting it, you can also test some of your vehicles other sensors by disconnecting the mass airflow sensor.
Sometimes mass airflow sensors get shorted or stop working and need to be replaced. Hi, I watched a video online which said you can test your mass airflow sensor by unplugging it with you car running. I left it as is and have driven it around town a bit, but now were at the point where the tags are due and it needs to be smogged. In some cases, the vehicle might run even better if the mass airflow sensor is bad. So I thought I had a bad maf sensor, and I bought a brand new unit. 2014 328d Wagon, self-tuned, 270hp/430ft-lbs.
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