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1.8 T single hesitation/clunk

audi5inline Nov 30, 2013

  1. audi5inline

    audi5inline Member

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    Hello,

    i'm new to the 1.8t engine, my car has a little problem.
    Its a a4 1.8t quattro avant with 6 speed manual gearbox, enginecode BFB
    When i drive at low rpm there are no problems.
    When i, lets say drive in 4th gear with 3000rpm and then shift back to 3th gear 3500rpm and than give some throttle, i can feel a single clunk/hesitation before the car takes of, when i rev the engine to lets say 4000rpm and then go back on the throttle there is almost no hesitation, its only there after a downshift.

    what i changed:
    -spak plugs
    -engine mount
    -snub mount
    -air filter
    -pcv pipe under the manifold
    -pcv check valve under the manifold

    - Checked diff mount
    - Checked gearbox mount

    it seems the problem is only present with the engine warm not there when cold. there are no fault codes, idle is also stable

    Could this be a bad coil ?
    any clues?
     
  2. vivalacoulter

    vivalacoulter Active Member VCDS Map User Gold Supporter Audi S5

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    If the coils were going then the engine management light would flash to signal a misfire I believe. Do you know when they were last changed?
     
  3. audi5inline

    audi5inline Member

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    They are the original and have never been changed.
     
  4. vivalacoulter

    vivalacoulter Active Member VCDS Map User Gold Supporter Audi S5

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    Then it could possibly be worth replacing them, but if there's no code coming up I'd be inclined to leave them for now.
     
  5. audi5inline

    audi5inline Member

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    There is indeed no code. The car takes of when i push the pedal, and after about half a second i get a single clunk/hesitation. So i think that rules out the drivetrain mounts...
     
    Last edited: Nov 30, 2013
  6. Ian2012

    Ian2012 Active Member

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    if it is coil packs then it's worth trying audi cos there is /was a recall for them, had ours done for free, have you scanned the car codes?
     
  7. audi5inline

    audi5inline Member

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    Yes no codes, i will try new coil packs this week and report back
     
  8. Mav190sline

    Mav190sline Active Member

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    Call Audi. Had coil packs replaced on my 04 a4 2 years ago and 01 s3 3 months ago. Both f.o.c
     
  9. Mav190sline

    Mav190sline Active Member

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    Recall no 28e9 if I remember correctly
     
  10. audi5inline

    audi5inline Member

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    changed coils yesterday and the problem is still there, i'm really thinking this clunk when i go on the throttle could be caused by the dual mass flyhweel...
     
  11. audi5inline

    audi5inline Member

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    any clues ?
     

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