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  1. #1
    Learner Driver DilapidatedFluff's Avatar
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    Whine / strange sound from engine bay, unaffected by RPM

    Forum Key Rings
    I have a whine that has developed recently that starts quietly at around 15mph and gets "faster" or changes in tone the faster the car is moving, but is unaffected by RPM, if I take the car out of gear it is still doing it.

    It seems to get quieter or go away for a minute or so after driving above 60 on the motorway, but that could just be my ears. It sounds completely centralised, but it's always difficult to work out where a sound is coming from in the cab.

    It's really obvious and loud in person, I got my passenger to try and film it with my phone (Which took three attempts to get the bloody speedo in shot!) I can hear it in the video most obviously when I let go of the accelerator and the car slows down, the pitch of the whine drops, just to be clear this is really quite loud, the video doesn't do it justice! Aircon/fans are off.

    As it's independent of engine RPM, could it be something to do with the wheels? It almost sounds like an air intake whooshing sound too. the garage thought it was brake pads on the rear wheels binding and had them stripped and cleaned but it still does it.

    http://sendvid.com/u6844yx8 < video!

  2. #2
    New Driver puppet's Avatar
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    Could be a few things, like a dodgy wheel bearing, although I would have thought your garage would likely have suggested that.

    The other thing that it could be, is the gearbox itself. Not sure exactly what model you have, but if there's a chance it has the M32 gearbox fitted, those are well known to have bearing issues, which sort of fits with your sound/noise description.

    I'm not sure exactly what all models have the M32 'box, but through my own costly experiences, I know for sure the petrol 1.8VVT does.

  3. #3
    New Driver ilunn's Avatar
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    Try slipping it in to Neutral (or just press clutch down) when its at its loudest if it then goes away it would point to gearbox/transmission if it does NOT go away then consider wheel bearing.

  4. #4
    New Driver puppet's Avatar
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    Quote Originally Posted by ilunn View Post
    Try slipping it in to Neutral (or just press clutch down) when its at its loudest if it then goes away it would point to gearbox/transmission if it does NOT go away then consider wheel bearing.
    As I understand it, whether or not the noise would go away by putting into neutral/pressing the clutch depends on the particular bearing that's noisy in the gearbox.

    In some cases yes, the noise might go away, however if it's the pinion bearing (think that's the right term) then it makes no difference whether you are in neutral etc. If the car is moving, then the pinion bearing is turning.

    Have a look here:

    http://www.wgmotorworks.co.uk/repair...n/m32-gearbox/

    "It is also quite common to get a constant whine in all gears from 20-30mph onwards, regardless of whether the clutch is engaged or disengaged, and which intensifies with speed. Often misdiagnosed as differential bearings, this is caused by pitted pinion bearings which can be seen on inner and outer races below."

    However, we've not even established that the OP has an M32 box!

  5. #5
    Learner Driver Mr Wullie's Avatar
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    Could be tyre noise/drone.
    what condition are the tyres in tread depth etc?

  6. #6
    Learner Driver DilapidatedFluff's Avatar
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    Quote Originally Posted by Mr Wullie View Post
    Could be tyre noise/drone.
    what condition are the tyres in tread depth etc?
    Hi, just to answer some questions,

    All four tyres are about three months old and in good condition

    As per original post, the sound is consistent irrespective of gear or if itís in neutral, the gear box feels fine there is no movement where/when there shouldnít be, etc


    Because it seems purely based on speed of the vehicle I am leaning towards wheel bearings - but I jacked the vehicle up and there isnít any play on the wheels so I am still at a bit of a loss.

    Also yes I believe it is an m32, itís an 1.8 SRi so Iím assuming it is the m32

  7. #7
    New Driver puppet's Avatar
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    Quote Originally Posted by DilapidatedFluff View Post
    Hi, just to answer some questions,

    All four tyres are about three months old and in good condition

    As per original post, the sound is consistent irrespective of gear or if it’s in neutral, the gear box feels fine there is no movement where/when there shouldn’t be, etc


    Because it seems purely based on speed of the vehicle I am leaning towards wheel bearings - but I jacked the vehicle up and there isn’t any play on the wheels so I am still at a bit of a loss.

    Also yes I believe it is an m32, it’s an 1.8 SRi so I’m assuming it is the m32
    Will be the dreaded M32 unfortunately, yes.

    When the bearings went in my own M32, there was absolutely no issue with the 'box at all, other than the whining that started to be noticeable at approx 40mph. No odd movement in the stick, no difficulty selecting gears etc.

    Might be a suggestion to change the oil in the gearbox, and look closely at the old stuff for any evidence of metal fragments/particles. If you catch it as you drain it, then strain it through a clean white cloth or similar, you should be able to see if there is anything there. If there's not, then great, and it's well worth keeping on top of oil changes on the M32 'box anyway.

    I also note that you look to have a 2011 car, which will have the original design of end casing on the gearbox. The later M32s had a revised end casing fitted to them, which was designed to hold bigger/stronger bearings, and also improve oil flow to the ones most prone to failing.

  8. #8
    Learner Driver Sharp's Avatar
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    Hi my 1.8 2013 has started to whine as above ,I believe it to be the pinion bearing ,is it likely to collapse and destroy the box and also has anybody had this bearing replaced or is it an exchange gearbox,

  9. #9
    Learner Driver Sharp's Avatar
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    Anyway took it to a gearbox specialists he originally thought wheel bearing ,put on lifter confirmed gearbox noise ,£700 to remove rebuild and refit ,then rang today ,play in dmf and recommends clutch change ,said he won't charge labour as box off already £1400 in total I think this is the last Vauxhall I will buy ,had a Toyota avensis before and didn't have one issue in all the years I had it,also Mrs has had a Yaris for 4 years again only servicing and tyres

  10. #10
    Drift King


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    Quote Originally Posted by Sharp View Post
    Anyway took it to a gearbox specialists he originally thought wheel bearing ,put on lifter confirmed gearbox noise ,£700 to remove rebuild and refit ,then rang today ,play in dmf and recommends clutch change ,said he won't charge labour as box off already £1400 in total I think this is the last Vauxhall I will buy ,had a Toyota avensis before and didn't have one issue in all the years I had it,also Mrs has had a Yaris for 4 years again only servicing and tyres
    so gearbox bearings, clutches and dmf only fail in insignias ?
    ​2015 Sri vx line nav Biturbo . Sri heated leather.5500k AFL . Vx line 20s,8inch LCD dash . LED Fog surrounds.30mm lowering springs.20mm H&R spacers all round. Mtec drilled discs all round. Auto wipers .VX puddle lights.

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