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S3 misfire when cold

Discussion in 'A3/S3 Forum (8L Chassis)' started by rsstu, Jan 1, 2011.

  1. rsstu

    rsstu New Member

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    hi there

    I recently purchased an 02 S3 with 80k

    when I viewed it at a garage and then collected it, they had ran it up to temperature which I now believe to be due to a mis fire when cold

    it goes once at temperature, I am suspecting coil packs??

    I had a full service done on her yesterday and the following fault codes came to light 16684, 16688, 16686, 16687

    Also, when really thrashing it, it crunches going in to third gear, any ideas??

    thanks for your attention to this and advice

    stu
     
    #1 rsstu, Jan 1, 2011
    Last edited: Jan 1, 2011
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  3. finesse

    finesse Active Member
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    Full service including plugs?





    I would;




    - change the coilpacks & check coil pack wiring


    -







    16684/P0300/000768 - Random/Multiple Cylinder Misfire Detected

    Possible Causes


    • Air Intake System leaking
    • Fuel Supply faulty
    • Injector(s) faulty
    • Ignition Cable(s) and/or Spark Plug(s) faulty
    • Ignition Coil(s) faulty
    • Exhaust Gas Recirculation (EGR) Valve (N18) stuck/open
    • Camshaft Position Sensor (G40) faulty
    Possible Solutions


    • Check Misfire Recognition
    • Check Air Intake System
    • Check Fuel Supply
    • Check Injector(s) and Injector Sealing
    • Check Ignition Cable(s) and Spark Plug(s)
    • Check Ignition Coil(s)
    • Check Exhaust Gas Recirculation (EGR) Valve (N18)
    • Check Camshaft Position Sensor (G40)
     
  4. rsstu

    rsstu New Member

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    brilliant thanks mate, change all coils packs??
     
  5. hades-

    hades- Yorkshire & Humber Rep.
    Regional Rep VCDS Map User

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    id take it back and let them fix it
    coil pacls will missfire hot or cold
     
  6. jojo

    jojo Looking for Boost!
    Staff Member Moderator quattro Audi S3

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    Crunching of the gearbox into 3rd is very common, most noticeable changing at high revs. An uprated dogbone mount(£20 from powerflex) will reduce engine movement and make gearchanges more positive. Trade off is more vibrations into through the steering column from the engine.
     
  7. rsstu

    rsstu New Member

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    thanks for your help guys
     

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