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Thread: 330ci 3 misfires(Help!)

  1. #1
    Join Date
    Nov 2017
    Location
    California
    Posts
    3
    My Cars
    2002 330ci

    330ci 3 misfires(Help!)

    So I have replaced the oem headers with aftermarket catless headers. I’ve been driving with CEL on and I want to try and fix the misfiring problems. I’ve got 3 misfires on my engine. I only have the o2 sensors that go before the cats on and the ones after the cats are off.
    Recently I have:
    Swapped spark plugs and ignition coils, also replaced valve cover gasket and injector o-rings and filter baskets.
    My first bmw I have owned so just curious if you guys would know or have any leads that I can check. Thanks for your time!

  2. #2
    Join Date
    Jan 2014
    Location
    USA
    Posts
    1,005
    My Cars
    04 ZHP, 83 320i, 00 M5
    Get a code reader and hook it up. I would think you will run into issues since the post cat o2 sensors are removed.

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