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Thread: Strange noise on kickdown - turbo or Auto?

  1. #1
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    Default Strange noise on kickdown - turbo or Auto?

    Hi everyone just joined as I have bought a Vectra 54 plate 3.0 V6 CDTi.

    Great car and no problem until I do a kick down (its an auto).
    About a second after a noise is emitted and lasts briefly (about half a second). The noise sounds like a metal to metal vibration sound as if a valve is being shut and bouncing at high speed. It is nowhere as high pitched as the turbo would be and my guess it would be equivalent to a few thou RPM type frequency.

    It is very repeatable and happens whenever the accelerator is suddenly moved and about a second later. If I were to move the accelerator suddenly to about 3/4 the sound would occur but much quiter. If suddenly moved to half then no sound at all. There is also a quiter echo. Not a real echo but the same sort of sound much quieter for about the same amount of time (half a second) just after the first sound has finished.

    I wonder if there is a valve connected to the turbo operation that is vibrating.

    I also wondered if this is not turbo related but auto transmission. It could be when the box changes down a gear under load. It is very difficult to tell if they happen together.

    I would be grateful for any help?

    Thanks
    Nigel

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    Can some one help me?

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    I can now update the symptoms as by first post was a little misleading.

    On flooring the peddle about half a second later there is a low pitched wistle in turbo terms but the sort of pitch you can wistle yourself. Sorry the best way I can describe.

    The wistle then goes and comes back in reducing volume waves. 3 or 4.
    Then on hitting 70mph the wistle is continuous.

    My thinking is that it could be a leak past a gasget under maximum boost.
    Does this ring a bell with anyone or am I barking up the wrong tree!

  4. #4
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    The problem has been fixed. The sound was comming from a broken/loose steel gasget in the exhaust near to the turbo. It was an engine out job as the access is restricted.

  5. #5
    [Ex]Admin Duncan's Avatar
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    Glad you got it sorted. I guess it had folks on here stumped with there being no replies!

    I'm guessing with it being an engine out job it was a fair few £££?, or did you have some sort of warranty on the car?

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    Regular Member parapaul's Avatar
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    Quite unusual not to get any help on here... Was it Road Trip season?

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