Misfires

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  • A80Avant
    S2Forum Obsessed
    • Sep 2005
    • 10873
    • Country: Greece

    #1

    Misfires

    I thought of starting a thread about those, so that anyone can read what to look for.Ill start but feel free to add any info you are aware of.

    From today's trip back home i developed a missfire that occured above 1.5ish bar of boost and happened on all gears. Initially i thought it was fuel pump related,but eventually and with some hints from a couple of friends i found the cause being in a slightly loose spark plug +/- the earth from the coil packs was being squeezed from the coil cap.Once i retightened and checked the plugs, i went for a drive and missfires were gone!
    SO:

    1) Spark plugs tightening
    2) Spark plug gap (too big, apparently bosch F5dpor have 0.4-0.5mm of gap.If it gets bigger,they need either replacement or bending of the rod to minimise the gap)
    3) Earth links
    4) Coil packs/coil pipes
    5) Fuel pump/fuel filter
    6) MAF/lamda sensor (in case you are still using these)
    Last edited by A80Avant; 20 September 2009, 18:57.
  • UrS4boy
    S2Forum Obsessed
    • Feb 2006
    • 11859
    • Country: Canada

    #2
    You might want to check out this post:

    http://forums.audiworld.com/showthread.php?p=18838360
    RS2'd 93 UrS4 5 spd sedan
    94 UrS4 V8 6 spd manual avant

    Comment

    • A80Avant
      S2Forum Obsessed
      • Sep 2005
      • 10873
      • Country: Greece

      #3
      that is great! good addition!

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