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Help - A3 1.8 T Sport (150hp) 1998 - Not sparking on 4th cylinder

betadeltamad Feb 28, 2014

  1. betadeltamad

    betadeltamad New Member

    Have had the car over a year now, done 5000 miles faultless driving until the other day.

    Driving back home, it suddenly decided to miss and run on 3 cylinders, it then decided to alternate between 3 and 4 for the rest of the journey and now is only running on 3.

    I went obvious and changed the plugs, no difference. Then taking off a coil pack at a time, from left to right, the engine would struggle (as it was only running on 2) until I took the 4th coil pack off and no difference to the lumpy, miss firing engine.

    Bought a new coil pack, tried it and still the same :/

    Tested the new coil pack with the wiring for 3 and it's fine.

    Stumped now, all wiring and connectors look good, why isn't coil pack 4 firing?

    Any help would be much appreciated.
  2. <tuffty/>

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

    Sounds like its the ignition control module... the ICM is attached to the airbox..

    Nilz likes this.
  3. betadeltamad

    betadeltamad New Member

    Thanks <tuffty/> much appreciated, my wallets a lot lighter but it's now back on 4 cylinders like it should thanks again!

    Quite a common failure then? Looks like the original bosch part that failed, my cars done 130k miles so I suppose cant grumble too much.
    Nilz likes this.
  4. makster1978

    makster1978 Member

    intresting,I tried disconnecting both switches on the ignition control module and the car was ready to stall until I quickly re connected,can these just be faulty,i have all the symtoms as above

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