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Cant figure out my misfires for the life of me

Ryanward13
in BMW Z3 & Z4 Series Forum

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Hello, I have a BMW Z3 1997, 1.9 L with around 115,000 miles on it. I have been having a problem where it shows ALL the cylinders have been misfiring. Codes P300, P301, P302, P303, and P304. I tried to put all different types of spark plugs, all new Spark plug wiring, new MAF sensor, new gasket for the intake, new ignition coil pack, Still getting these codes. Any ideas or suggestions that could help me get in the direction I need.

  • Quote

    Morning Ryan

    Welcome to the Forum

    Spark Plugs should be Bosch FGR7DQP or NGK BKR6EQUP the Coil pack is it OEM or a Pattern Part ? Are the Spark Plug leads in good condition no rubbing or chaffing 

    Check carefully the engine bay wiring for any cracks, chaffing or damage clean the DME connections with a good electrical contact cleaner finally check the engine earth straps and earth connections in the engine bay

    I am assuming this isn't a mechanical issue, compression all Good

    Dave

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