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Thread: Strange sucking noise CDTI 120

  1. #1
    Regular Member GoldenWonder's Avatar
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    Default Strange sucking noise CDTI 120

    I know noises are a bit tricky to diagnose from descriptions but here goes..

    On my CDTI 120, when the engine is cold (or not fully hot anyway) I get a strange sucking sort of 'gasp' noise when changing up through the gears (unless I let the revs drop down low). It only last a second (it coincides with the clutch being depressed) and is noticeable from 1st to 2nd, 2nd to 3rd and less so 3rd to 4th (presumably because the difference in engine speeds are less)

    When the engines warm, it seems to go away. Anything to worry about?

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    Regular Member John35's Avatar
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    Turbo ?????????

  3. #3
    Regular Member GoldenWonder's Avatar
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    Not a normal turbo noise then?

    I did notice in the service history that the turbo was replaced at 54k, and its now at 70k

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    Regular Member John C S's Avatar
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    It's sooo difficult to diagnose these sorts of noises when you can't hear them.

    Could it be one of the rubber pipes from turbo to intercooler and vice versa has a split in it??

    Just a suggestion.

    it would be unlucky to have 2 turbos go on a vehicle.

    Diesel Turbos are quite robust although failures aren't exactly unheard of in the CDti.

  5. #5
    Regular Member GoldenWonder's Avatar
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    I did think of a split pipe maybe (its mentioned on here before) but why only when the engine is cold?

    The turbo is fairly noisy anyway, in that zzzzzz kind of way but only makes this noise when cold.

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    try driving along in 2nd build up revs quickly and let go of the accelerator and see if it does it then, if it does this is perfectly normal as its just the waste gate. I have same engine and mine does this kinda sounds like a mini dump valve.

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    Regular Member ditchp's Avatar
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    Vehicle : Vectra cdti estate

    Trim : Get a

    Engine : Dirty diesel

    Year : 2006

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    same here, only mine is exagerated by my twin exit exhaust.....sound's great imo
    Midlands Mod Shop - NFFC.

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    Regular Member GoldenWonder's Avatar
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    I'll give that a try - just need to find a quiet stretch of road!

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