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  1. #1
    LTX Member


    Status
    Offline
    Join Date
    Mar 2016
    Name
    Chuck
    Vehicle
    1996 Impala SS
    Location
    Morganville, NJ
    Posts
    10

    Default P0300 all cylinders

    Does the OBD2 pcm stop reporting misifes with MAF unplugged?

    MAF grms/sec drop to 2.46 (from ~10 plugged in) --no misfires. Cleaned MAF twice--MAF wiring checks out ok. Should i be looking overly lean or overly rich as my issue? Bad MAF or other sensor? wiring? O2's seem to be functioning as they should. open loop/closed loop misfires

    LTFT -15 -13 maf unplugged
    STFT -7 0 maf unplugged.

    IAC counts warm with maf plugged in 65 unplugged 75 IAC ohms out ok

    Opti wiring checked ok - opti to ICM checked ok. Installed known good opti harness --2 different opti's -new Autolite 104's and Taylor Thunder volt wires. Fuel pressure good 37 / 44 . new intake gaskets. known good ICM(?) installed. new coil.

    engine vacuum 20" MAP reporting 40kpa Baro 104

    This is the readers digest version, but any help or advice is appreciated.

    Thanks,
    Chuck

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