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  1. #1
    Active Member Two Rings Slaab1's Avatar
    Join Date
    Aug 07 2017
    AZ Member #
    404497
    Location
    Massachusetts

    2003 a4 3.0 misfires. Anyone actually fixed it?

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    Iíve seen on these threads where someone has posted all their codes and talked about the misfires. A bunch of people talk about it could be this or it could be that. Does anyone have any examples that they did X or Y and it fixed it the problem? It seems that the posters all say they changed the plugs, coil packs and such with no luck. Anyone have a success story they can share? Thanks in advance!


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  2. #2
    Veteran Member Four Rings imnuts's Avatar
    Join Date
    Aug 12 2009
    AZ Member #
    46297
    My Garage
    Dolphin Grey Audi A4 3.0 Q 6MT
    Location
    Dirty Jerz

    I had random misfires that would come and go. The best I could potentially replicate the issue was after a high RPM run. One day I happened to have Torque running when my car started misfiring and it was running quite lean, AFRs 15-16+. A few days later I logged my car on a 2nd-3rd gear WOT run and noticed the one bank was running leaner than the other. A few months later, I changed it the fuel pump, injectors, and fuel filter. I haven't had any issues with misfires since. I was at about 180-185k miles on the original pump and injectors at that point.

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  3. #3
    Active Member Two Rings
    Join Date
    Nov 04 2017
    AZ Member #
    409366
    Location
    Bakersfield

    Check your coil connectors to see if pins have backed out of the housings. If not making contact that would cause misfires at random if there rattled out of positions


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