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Please help! Air Mass Meter Failure 900 1994

posted by  Fife on  Sat Apr 16 06:46 CST 2005
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My 1994 940 Turbo was running great. I went to wash the engine at the carwash as I have done many times before. Afterward, the car started just fine and ran fine as I brought it home (approx. 6 mile drive). I parked it and the next day I went to start it. It wouldn't start. I thought perhaps when I washed it, I might have gotten water in the distributor. Checked out dry. I unplugged the Air Mass Meter to see if it would start, and it started right up. So, I thought perhaps moisture was faulting the sensor. I let it dry out for nearly a week now, but same problem. Tried disconnecting the battery to reset the signal with no success. Is there a way to reset the sensor signal to the meter, or does unplugging the meter prove a damaged meter if the car starts when it is unplugged. I should note that the platinum filament in the AMM is still in tact(not broken). Could it still be bad??? If so, can anyone recommend a place to get a used but tested AMM on the web.

Thanks in advance for any help.








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    Please help! Air Mass Meter Failure 900 1994

    posted by  rjk on  Sat Apr 16 09:06 CST 2005
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    last visit: Sat Dec 12 12:30 CST 2009
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    Check the FAQ's

    http://www.brickboard.com/FAQ/700-900/EngineFuelinjection.htm#TechnicalNotesonAMMCalibration

    but in a word, yes, it sounds like your AMM is bad if it starts w/o it plugged in but won't with it attached. Do you have a turbo? If not, you should have a thermostat in the airbox that opens/closes a flapper valve. This t-stat goes bad and the airbox charge air will overheat and bake the AMM.

    Never changed your airbox t-stat before? Probably the root cause of your AMM failure.

    Bob K

    '94 945T (daughter co-opted it for college, used to be mine)
    '99 S80 (mom-law's)
    '88 240DL (son's)
    '84 242Ti (for sale)
    '89 560SL (wifemobile)
    '88 300TE (my commuter)
    '68 GT500KR (under restoration)







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