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Old 08-09-2006, 09:36 PM   #1
neilbrown62
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Help! Car will not stay running. MAF?

My 99 BMW 323i will not stay running. I can start it and race the engine to 4000 RPM and keep it there, but as soon as I back down the engine stalls. It will not run at idle at all. The check engine light just came on..code is P0101 for "MAF or VAF CKT Range/Perf". Car has running fine until just know. Has 150k miles and no mods to intake or engine. Does anyone have any suggestions???

NEIL
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Old 08-09-2006, 11:10 PM   #2
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Old 08-10-2006, 09:27 AM   #3
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At 150k on the clock the MAF sensor is probably dirty. If you have some hand tools it shouldn't be hard to try cleaning it yourself. Look for the sensor wires going to a section of the intake tube, downstream of the airbox.

The MAF sensor is a part of the intake tube - inside, it has some relatively delicate wires that are heated by passing current across them. Then, the amount they cool due to the intake airstream is used to calculate the volume of air flowing into the engine.

If these wires get dirty, it gives bad readings to the ECU and the calculations are no longer accurate. At low-volume times (like idling) it can make the engine stall.

It should be removable with simple tools. CRC Industries makes a dedicated spray MAF cleaner you can get at a good parts house. Otherwise, you could probably use carburetor cleaner. Whatever you use, don't poke or wipe the wires, because they're pretty delicate. Unless you see obvious damage, I'd try cleaning it before you replace it.
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Old 08-10-2006, 04:51 PM   #4
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I REPEAT do not use carb cleaner IT WILL RUIN THE MAF!!!!! use crc only if you can get the BMW fault code number I may be able to get you some information.
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Old 08-10-2006, 05:47 PM   #5
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OK, thanks for the warning.
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Old 08-10-2006, 10:18 PM   #6
neilbrown62
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OK, I have a buddy with the same car. He let me put my MAF on his car and it ran fine. So it is not the MAF after all. Code P0101 also says VAF could be at fault. Anyone know what the VAF is? Anyone have other suggestions based on my symptoms at the start of this thread? I appreciate all the help. Thanks, NEIL
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Old 08-10-2006, 10:22 PM   #7
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I will try to get the BMW fault code.
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Old 08-10-2006, 10:26 PM   #8
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my friends car kept stalling too when he let of the throttle, sure it wasent a bmw but this might help. I dont know "codes" well but heres my two cents. His car kept stalling due to a hole in his exhaust which didnt have enough backpressure to keep the engine running at idle. One we replaced the downpipe, the car was fixed.....has your car been running louder than it should?
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Old 08-11-2006, 02:13 PM   #9
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I hadn't noticed any exhaust leak recently. I can run the engine at 4000 RPM to keep it from stalling, and I don't hear any exhaust issues. But thanks for your suggestion.
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