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Thread: 3.0 cdti turbo noise?

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    Default 3.0 cdti turbo noise?

    Evenin' gents, can someone help with this problem I have? My 3.0 Vectra has what I can only describe as a metallic whirring noise that gets louder as the revs rise. It happens stationary as well as when driven and if the engine is revved hard the 'whirring' continues after the revs settle back at idle, ie: out of synch with the revs. Also when the engine is switched off this horrible noise continues for a while so I assume it's not pulley/belt related. There seems to be no downturn in performance but it's driving me nuts! Is there a sure fire way to test if the turbo is at fault? (mileage: 74,000). Incidentally the turbo seems to be whistling away quite normally and is obviously boosting properly.

    Any ideas gratefully recieved.

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    Regular Member m8internet's Avatar
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    Sounds like either a pre-turbine or air/boost leak
    However, the big clue is that the noise continues after you have switched the engine off
    This almost certainly points to a air/boost leak

    Have someone sit in the drivers seat, that can hold steady revs
    With the engine running at just under 1500rpm
    Feel over the engine bay for any unusual air jets
    There shouldn't be any
    However, lifting the engine revs to about 2000rpm should be enough to activate the turbo, which you should be able to hear
    Again, feel over the engine bay for any unusual air jets
    Switch the engine off, then repeat

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    Quote Originally Posted by m8internet View Post
    Sounds like either a pre-turbine or air/boost leak
    However, the big clue is that the noise continues after you have switched the engine off
    This almost certainly points to a air/boost leak

    Have someone sit in the drivers seat, that can hold steady revs
    With the engine running at just under 1500rpm
    Feel over the engine bay for any unusual air jets
    There shouldn't be any
    However, lifting the engine revs to about 2000rpm should be enough to activate the turbo, which you should be able to hear
    Again, feel over the engine bay for any unusual air jets
    Switch the engine off, then repeat
    I will give this a go,but would that cause a whirring noise? earlier today someone had suggested waterpump, is that atall likely??

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    Regular Member m8internet's Avatar
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    I've never heard a waterpump over the noise of an engine, always need a homemade stethoscope for that!
    Usually when the waterpump has failed there is a metal to metal noise which stays in step with the revs, but it usually stops when you turn the engine off
    Also often accompanied by water loss in the cambelt area

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    Quote Originally Posted by m8internet View Post
    I've never heard a waterpump over the noise of an engine, always need a homemade stethoscope for that!
    Usually when the waterpump has failed there is a metal to metal noise which stays in step with the revs, but it usually stops when you turn the engine off
    Also often accompanied by water loss in the cambelt area
    highly unlikely then...........i'll try your idea tomorrow in work.

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    The only wiring noise I get is if I have had my A/C on for ages and its working hard. Maybe that?
    Now I need a turbo to keep up!

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    That's a good point, although the air con makes a kind wheeze noise as soon as you switch the engine off as the pump looses pressure

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    Very true, just another possibility
    Now I need a turbo to keep up!

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    I've had my 1.9 150 cdti for about 10 weeks now, and i also get a whinning noise from my car, esp in the morning.... once i though there was a police car behind me lol,

    thought it was normal

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    Quote Originally Posted by mickontherun View Post
    i also get a whinning noise from my car, esp in the morning.... once i though there was a police car behind me lol,
    thought it was normal
    That might be the wheel bearing inner ring needing replacing
    Starts off sounding like tyre noise, gets gradually louder, and is then joined by a harmonic vibration which is what my car is now suffering from
    The rear tyres and brake discs are also show signs of deformation, so will also need replacing, but all these will be replaced under the warranty claim

    Mine was due to be done last week, abandoned due to wrong brake parts, rescheduled for today, and abandoned again
    The reason given this time is that Retailer Warranties advised that a new part is going to be available shortly, so the dealership will return what had arrived and wait for this instead

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