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Thread: heavy misfire with only an o2 check engine code and nothing else

  1. #1
    Join Date
    Sep 2015
    Location
    Chicago IL
    Posts
    20
    My Cars
    1994 BMW 325IS

    heavy misfire with only an o2 check engine code and nothing else




    for the past week now my car has had a slight misfire only in the high rpms after I floor it.When i had a broken i take boot the symptoms were the same as this but nothing is wrong so I replaced the MAF and it mostly fixed until now after leaving school for lunch car starting jerking really hard on throttle and when down shifting my pops and bangs were separated by very long intervals(I have a burble tune and should pop every seccond past 3k) and huge ass backfires.If this helps my car smells like a two stroke so I'm guessing it's running lean at the moment.

  2. #2
    Join Date
    Jun 2010
    Location
    NY
    Posts
    9,098
    My Cars
    1997 328i
    Could be weak fuel pump. Also check that the ignition boots are in good shape and that there is no oil on top the spark plugs.
    Attn. NEWBIES: Use the search feature, 98% has already been discussed.
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