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Thread: missfiring on cylinder, ARRGGHH

  1. Exclamation missfiring on cylinder, ARRGGHH

    all,

    first problme i've had with my 07 mps 3 bk,

    i was under boost at approx 100k driving normally with cruise control when suddenly i lost boost and the engine cut out for about a second. like a backfire pop

    everythign was then fine and about 5 minutes later the car began bogging down, barely able to make boost and the external boost gauge was fluttering like mad.

    pulled up and the car was backfiring and running super rich, the exhaust is shooting out little black spots and smells like fuel.

    I've swapped the coil packs round as 3rd cylinder was not firing, swapped with second cylinder and the coil pack is fine, i'm suspectign plugs so removed the plug and has buildup though nothign too bad.

    car is still doing it and unable to be driven, i dont have a AP or scanner so i cant clear codes.

    ANY HELP??

  2. #2

    Default

    Sounds like a boost tube has come off, been there.

  3. #3

    Default

    Is your car sstock intake? If so maybe the plastic nipple has broken or tube fell off. That will cut boost and make the car run rich. Also check the EBCS it could have a broken nipple or tube fell off.

    Couple of easy checks.

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