Engine intermittently misses

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This topic contains 1 reply, has 2 voices, and was last updated by Nightflyr * Richard Kirshy 2 years, 5 months ago.

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  • #990042


    I was hoping I could get answer to a problem I have with my car. It is a 2002 VW Polo 9n, engine code is AWY.

    When the engine is up to temperature, at idle, it feels like the engine is misfiring.

    For example, I come to a light, engine starts to idle normally. And then in every ~10-15 seconds it feels like 1 ignition misses. So I feel the engine stutter, but only for a moment. Then it idles fine again for ~10-15 seconds, and then again, like a hiccup.

    Also, at these times, if I hit the gas rather quickly to rev up the engine to around 2000-2500, it feels like a cylinder is not working for 1-2 revolutions, but then everything is fine. I can feel the chassis shake a bit, and can also hear this in the exhaust. It sounds like a cylinder is not working. But again, only for like 2 crank revolutions or so.

    With the engine running at idle, if I try to remove the oil filler cap, I can feel strong vacuum. If I do remove the cap, the engine starts to shake violently, but does not stall. Pulling out the oil dipstick does nothing. I don’t feel vacuum there.

    When moving, everything feels good, the engine pulls as it should. No error codes stored.
    I know the oil is way overfilled. It is around twice the level it should be at max. New oil is on the way, so I’ll change it soon.

    Please be so kind and let me know what I should check. Or point me to a forum topic that can help me solve this issue.

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  • Author
  • #990044
    Nightflyr *
    Richard Kirshy

    Possible causes:
    Faulty spark plug / coil / wire
    Faulty fuel pressure
    Faulty fuel pressure regulator
    Dirty / faulty injector
    Check for clogged / faulty PCV valve

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