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  1. #1
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    E39 530i Engine misfire during cold starts and when engine at idle RPM for along time

    I have a 2002 BMW E39 530i with a M54 engine. I have an engine misfire issue during cold starts and becomes normal(no more misfire) when engine reaches its normal operating temp and when i switch off and re-start the engine. The engine misfire also re-appears when the engine has been in idle RPM for about 2 min or longer, and again if you re-start the engine the misfire is No more. I have isolated the misfire to the 3rd cylinder. I have changed all 6 coils and spark plugs, the airflow sensor and have done a compression test which shows no abnormalities. My engine compartment wires connecting the ignition coils to the ECU has been repaired. Could this trigger the above fault. Any suggestions or advise would be highly appreciated.
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  2. #2
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    Sundance Mesa, NM, United States
    Member No: 4328 jimlev will become famous soon enough jimlev will become famous soon enough jimlev's Avatar
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    Oct 2000
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    Didn't you get an answer over on bimmerforums?
    Just a few mods.
    If it ain't broken make it better and quicker!
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