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Smoke when going down hill. Also rough idle and cold runing

dayofthejackal Apr 30, 2014

  1. dayofthejackal

    dayofthejackal Member

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    My car ran perfectly with just a stage 1 remap then I did a stage 2 conversion on it and now I have loads of grey and blue smoke coming out of the exhaust but only when going down a hill and only at low (below 2K) revs, also if I brake hard which clears on the flat after a few seconds.
    Normal driving on the flat or going up hill is fine, no smoke on idle or when booting it.
    AND
    Since stage 2 I've also got a very rough idle, sound like I'm revving the car.
    AND
    The power cuts out between 1.2k and 1.8k revs especially when cold, it's un-drivable cold.

    No codes showing, I did a home made smoke test and no vacuum leeks showed.

    Smoke = Turbo or Rings?
    Idle and running = ???
     
  2. s3dave

    s3dave TFSI Hybrid Supporter

    10,110
    736
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    Breather system blocked? do you have a catch can?
     
  3. dayofthejackal

    dayofthejackal Member

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    I fitted a new catch can with new pipes about 500 miles after doing the conversion. I had a 15mm and fitted a 19mm.
     
  4. s3dave

    s3dave TFSI Hybrid Supporter

    10,110
    736
    38
    just let it vent to atmosphere and see if it helps,
     
  5. dayofthejackal

    dayofthejackal Member

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    Tried vent to atmosphere and no difference.

    Could the power cuts be something to do with wastegate actuator. When the power cuts I can hear a sound like air dumping or turbo spooling but its not the recirc' valve, tested without it.
     

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