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s3 8l compression issues

rob fulham4eva Jun 12, 2013

  1. rob fulham4eva

    rob fulham4eva New Member

    so took my s3 for a run on monday night(spirited driving) as i put my foot down there it seemed a little hesitant so pulled over checked under the bonnet all was fine and idle was perfect so set of again no problems what so ever and on my way home it started misfiring and was struggling badly to get me home.

    ive changed the coilpacks for new ones and the spark plugs also new(i did notice on inspection that the piece that goes around the electrode was loose and close to coming off in cyl 2) and this did nothing.
    i then did a diagnostic test and nothing came up
    and then a compression test (not good)

    1 150
    2 20
    3 150
    4 150

    ive checked the oil level(no change) also changed 3 months ago
    the coolant(no loss but a more darker pink)

    i have had problems with coilpacks recently and it always been cyl 2
    so when i did the diagnostic test i gave it a little rev i noticed smoke and condensation coming up from the oil cap and there was smoke from somewhere else couldnt tell as i was behind the wheel.

    so i have 3 ideas
    cylinder head crack
    bottom end

    its a 225bhp model with a custom code stage 1 remap 255 bhp

    ill probably strip it down tomorrow but i just want peoples opinions before that.
    cheers(sorry about length of post)
  2. s3dave

    s3dave TFSI Hybrid Supporter

    Amk Heads seem to be vulnerable for cracking...
  3. rob fulham4eva

    rob fulham4eva New Member

    it the bam engine code mate
  4. phil miller

    phil miller Well-Known Member VCDS Map User

    could be anything, burnt valve, weak gasket, cracked head, damage to piston crown, it needs to be stripped and inspected :)
  5. rob fulham4eva

    rob fulham4eva New Member

    ok mate do you reckon that could be why i keep loosing coilpacks?
  6. <tuffty/>

    <tuffty/> Badger 5 Edition...Its all about the flow... Staff Member Moderator Audi S3

    Don't rule out a bent rod either... get cyl 3 to TDC, use a long thin stick or similar and poke it down the plug hole and measure how much it pokes up... then plonk it into cy 2... if its lower its a bent rod...


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