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Thread: Engine noise on idle - V6CDTi

  1. #1
    Regular Member Celes's Avatar
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    Vehicle : Opel Signum

    Trim : Sport

    Engine : 3.0 CDTI

    Year : 12/03

    Default Engine noise on idle - V6CDTi

    After a cold start it runs great! Quiet as a mouse. But once warmed up there seems to be a clatter of some sort. Pretty sure it isn't the DMF causing this noise even though it is knackered.


    Should I be worried?

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    It could be an idler pully .

  3. #3
    Regular Member Celes's Avatar
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    Vehicle : Opel Signum

    Trim : Sport

    Engine : 3.0 CDTI

    Year : 12/03

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    Replaced them not so long ago. It made that noise before the service too.

  4. #4
    Regular Member Celes's Avatar
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    Vehicle : Opel Signum

    Trim : Sport

    Engine : 3.0 CDTI

    Year : 12/03

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    The noise seems to be better after some sporty driving.

  5. #5
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    DMF will only clatter when you let foot off the gas and engine re-coils.

  6. #6
    Regular Member Celes's Avatar
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    Vehicle : Opel Signum

    Trim : Sport

    Engine : 3.0 CDTI

    Year : 12/03

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    I know, that's why I ruled it out.

  7. #7
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    Without have a listen you cant tell. What about tappets they get wider when the engine is warm.

  8. #8
    Regular Member Celes's Avatar
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    Vehicle : Opel Signum

    Trim : Sport

    Engine : 3.0 CDTI

    Year : 12/03

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    Thought about that too as the engine has 163k miles with original tappets, but why is the engine quieter now that I'm ragging it?

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    When you rag it the engine is reving so fast and with othe noises it may seem quieter doing that.

  10. #10
    Regular Member Celes's Avatar
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    Vehicle : Opel Signum

    Trim : Sport

    Engine : 3.0 CDTI

    Year : 12/03

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    After some slow driving the noise is now louder?

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