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Re: Air mass meter 900 91

posted by  someone claiming to be Dave Stevens on  Mon Feb 12 20:20 CST 2001 [RELATED]

If disconnecting the AMM makes the engine run better then that makes the AMM a prime suspect, otherwise (as in your case) the test is inconclusive. Check running at idle and accelerate through ~2000+ rpm. The best way to check an AMM is to swap with an identical good unit. Also, it's not a good idea to connect/disconnect the AMM (or any other ECU sensor) with the ignition on. These components are too expensive to risk frying accidentally.

Your 2-3-2 FCU fault code (as I recall) is for running too lean. You cleared all codes after replacing the system relay, right? If the check engine light is not on then it may just have been a momentary condition so clear the code a second time just to be sure. A flaky AMM is only one possible cause. Carefully check for vacuum leaks -crack in air supply tube, disconnected or split vacuum hoses, leaky throttle body gasket. A bad fuel pressure regulator could also cause this. Other people may have some other suggestions for you.





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