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LCR - mystery vibration...

Discussion in 'Leon Mk1 (2000-2006)' started by 6th.replicant, Aug 14, 2018.

  1. 6th.replicant

    6th.replicant Active Member

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    When turning right with the suspension under load - eg, on roundabouts - there is a vibration, which sounds like a mini road drill, emitting from the left-front of my LCR.

    My regular garage, a longstanding VWG specialist, has ruled out loose engine or gearbox mounts, anti-roll bar links or anything differential-related.

    They assumed it was the inner CV joint because the gaiter was split. So, a new OE-spec GKN CV joint has been fitted. But it’s made no difference - the vibration remains.

    Anyone know what it could be?

    Ta :)
     
  2. xyz

    xyz Full Member

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    Drive shaft perhaps? Is it only when cornering?

    Sent from my HTC One using Tapatalk
     
  3. 6th.replicant

    6th.replicant Active Member

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    Nope, driveshaft is OK.
    Only happens when turning right above c. 35mph - at town speeds there’s no vibration.
     
  4. xyz

    xyz Full Member

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    Bizarre - that would suggest cv joint but that's been ruled out.
    Sent from my HTC One using Tapatalk
     
  5. 6th.replicant

    6th.replicant Active Member

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    The garage suggests it could be the wheel bearing - does that make sense?
     
  6. bruceR

    bruceR Active Member

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    That’s what I was going to suggest, it does make a rumbling noise when cornering, replace both for peace of mind


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  7. Alexis27

    Alexis27 Active Member

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    Try sticking the spare tyre on
     
  8. 6th.replicant

    6th.replicant Active Member

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    Wheel bearing has been replaced but it has not cured the vibration. Grrrrr!
     
  9. g60stu

    g60stu Full Member

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    As @Alexis27 said, is it worth swapping the wheel/tyre to eliminate that? Though I guess that doesn’t tie up with your mini road drill description. Long shot but maybe worth a try.
     
  10. wilfster

    wilfster Active Member

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    You say the inner CV joint was replaced and the driveshaft is OK. Are you sure the outer CV joint is OK on both sides of the car?
    Is there anything with minimal clearance from the brake disc, such as a bent/corroded/loose backplate, loose brake pipe, etc., that could be fouling when the suspension is compressed?
    Are the driveshaft nuts torqued up correctly?
    Stone between the disc and backplate?
    Is there any vibration or unevenness when braking?
    Broken roadspring or knackered top mount?
    Are the wheelbolts correctly tightened? Seems obvious but I once had a similar problem when a garage had used loctite on the bolt threads. This caused the torque wrench to break prematurely before the bolts were tight.
     
  11. 6th.replicant

    6th.replicant Active Member

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    Thanks for reply.
    It was assumed the inner CV joint was the cause because its gaiter was split - the other 3 gaiters are OK.
    The drive shaft and outer CV joint are both OK.
    The wheel bolts are correctly tightened.
    The top mount is fine, as is the spring, brake cable and back plate.
    Have done much wheel / tyre swapping.
    No vibration when braking.
    The vibration only occurs when turning right with the left-side under load.
     
    #11 6th.replicant, Aug 21, 2018
    Last edited: Aug 21, 2018
  12. DorsetChap

    DorsetChap Active Member

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    Have you replaced both front wheel bearings. This platform is notorious for the sound appearing to come from one side when it's the other bearing that's on its way out. Ask me how I know!
    Have you checked whether any screws holding the arch liner have come out (on both sides)? With the same thinking it could be that the tyres could be too wide.
    Could try jacking it up and rotating the wheel by hand on full lock - might just hear something.
    Only other thing I can think of is one of the other cv's has gone, even though the boots are ok.
     
  13. andycupra

    andycupra status subject to change

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    any possibility it could be abs / ESP?
    check over the wiring to the abs sensor etc particularly when steering on lock. particularly where the wire connects to the sensor.
     
  14. 6th.replicant

    6th.replicant Active Member

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    This morning I drove four comparison ‘laps’ around the Hanger Lane gyratory (which is basically a very large roundabout).
    I entered the corners at the same speed in-gear and then on the next lap in neutral - when in-gear the vibrating / groaning noise is ever present; when in neutral there’s *no* noise.
    Could it be the diff?
     
  15. Andrewwright

    Andrewwright Turbo lover

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    I had this kick in at speed, the ECU tried to spin the car out , was really just luck that I held it and the TC kicked in and turned off. Soon as I can I'm getting it coded out, always turn it off now. Crazy how a safety feature nearly killed me....wouod have been my fault as I shouldn't have been doing such speed.
    Is a wheel/speed sensor failure.

    Sent from my Nexus 6 using Tapatalk
     
  16. Andrewwright

    Andrewwright Turbo lover

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    I'd be checking the other side first

    Sent from my Nexus 6 using Tapatalk
     
  17. 6th.replicant

    6th.replicant Active Member

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    The “other side” of what?
    Ta :)
     
  18. Andrewwright

    Andrewwright Turbo lover

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    Other side CV/driveshaft

    Sent from my Nexus 6 using Tapatalk
     
  19. 6th.replicant

    6th.replicant Active Member

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    The right-side CVs, drive-shaft and wheel bearing appear to be OK.

    Does no-one think it’s significant there’s no vibration / groaning noise when cornering with the gearbox in neutral?
     
  20. Andrewwright

    Andrewwright Turbo lover

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    Hard to say as we are not there. Do you feel it through the floor or steering wheel? Or both? Does it go into gear ok? Could be flywheel vibration if shafts are ok

    Sent from my Nexus 6 using Tapatalk
     

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