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2010 Audi S3 running rough on cold start-up

Braveheart May 10, 2013

  1. Braveheart

    Braveheart New Member

    I've got a 2010 model with 28K which now has started running rough on initial cold start-up. It's almost like it's misfiring but tough to say. Quite a strong smell of petrol as well. After a couple of minutes, she comes good and no issues at all when running part-warm or hot and no engine warning lights on. It's just the initial start-up when cold that's the problem. Trying to drive the car within a couple of minutes of cold start-up before the 'roughness' has stopped is a bit of a spluttery affair.
    I installed a Shark Stage 1 remap a year ago but back to running factory map at the moment because car was in getting final service at dealership under warranty period a couple of weeks ago. Only other mod is Blueflame cat-back exhaust which means I've blanked off the factory rubber exhaust valve pipe by screwing in a small bolt but that was done almost a year ago and the cold-start problem just started fairly recently. Dealership forgot to reset my service indicator so I'm getting the "Service Due" warning every day but can't believe that's connected. Like I said above, car runs spot on otherwise and MPG hasn't deteriorated, it's just this annoying spluttering on cold start-up that's a pain :ermm:

    Any suggestions where to start with this would be greatly welcome!
  2. percymon

    percymon Member

    Did this only happen post the service ?

    What did they do in the service regime - spark plugs ?, fuel filter ?
  3. coreythorny

    coreythorny Active Member

    Could be worth checking the Cam follower?
  4. Braveheart

    Braveheart New Member

    Third service so just an oil & filter change so they shouldn't have been poking around anything else to upset anything.


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