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Problem after fixing my car

MikeCrum1996 Feb 5, 2018

  1. MikeCrum1996

    MikeCrum1996 Member

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    So after fixing my car yet again.. which I had the car wobble at speed of 20 upwards the entire cabin would shake but by replacing the passenger driveshaft the car is shake free but has a really annoying humming/rumbling noise when driving 20-40mph then the noise disappears until I get back within speeds again..
    All the wheel bearings are all good no play at all.. also it’s not the wheels/tyres as I’ve swapped all my wheels around..

    So my question is what could be causing this noise? It’s so annoyingly
    I’ve got an idea of a few things.. maybe it could be the fact I never torqued up the hub nut properly ? I just made it super tight.. I used my old catalytic converter as leverage bar.
    Also it’s not the brakes as the noise continues when braking ..
    Could that hub nut make such a difference?

    Any help much appreciated.
     
  2. tcg

    tcg Well-Known Member

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    Have you had your wheels balanced lately mate?

    All that shaking could have dislodged a wheel weight perhaps,might be worth getting them checked,it's a cheap option to rule out first.
     
  3. Mario

    Mario Active Member Audi A4 quattro TDi S tronic S-line owners group Manual

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    Bad wheel bearings don't usually have play until they are REALLY bad. Always starts off with a noise. Only way to check to to strip each side down and spin the hub with nothing connected (no brakes, no driveshaft, nothing) and listen for a noise from the bearing. Good ones are 100% silent.

    Also, I would probably get the hub nut done up properly. Usually torqued to a setting and then another 90* or 180* turn (check the service manual).
     
    Alex C likes this.
  4. MikeCrum1996

    MikeCrum1996 Member

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    Wheels have been balanced,, I’ve been told by about 3 different mechanics told me that the wheel bearings are fine
     
  5. Erikn89nl

    Erikn89nl Well-Known Member

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    Never underestimate Murphy's Law... last week at work, 4 engineers (myself included) checked to see if an electrical test pin was properly connected. All 4 agreed that it was. The next day we found out we all had it wrong...
     
  6. ben4866

    ben4866 Member

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    Does the noise change tone when driving round a bend? I always find worn wheel bearings change tone when weight transfer loads them up in the bends

    If you had such a bad vibration from the driveshaft then maybe it has taken out the differential bearings in the gearbox?

    It sounds more likely a wheel bearing to me, mine has a rumble coming from the Nsf when going 70mph or more.
     
  7. MikeCrum1996

    MikeCrum1996 Member

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    When I’m driving 70mph it’s completely silent saying that though when I turn left the noise goes quiet until I drive straight again
     
  8. MikeCrum1996

    MikeCrum1996 Member

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    Good point! The only real way to know is if I change the bearing to see if it helps
     
  9. Mario

    Mario Active Member Audi A4 quattro TDi S tronic S-line owners group Manual

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    Points to a bad wheel bearing on the left side. When you turn left the weight transfers to the right, so less load on the left side, if that makes it go quiet then a left bearing is failing. Also, turning the other way (right) may make it go louder as more weight / load is put onto it.
     
  10. Stuart B

    Stuart B Well-Known Member

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    Tyre pressures? Maybe just tyres or is it a squeal?
     
  11. RobinJI

    RobinJI Active Member

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    Oddly I've had the opposite happen twice. The bearings rumbled when going straight, but actually got quieter when loaded up. It's counter-intuitive, but it's definitely happened to me more than once!

    One trick I've found quite effective for finding noisy bearings that don't yet have play in them is to spin the wheel while holding the shock absorber. You can usually feel a vibration it there's a bad bearing even when you can't hear it or feel any play in it.
     
  12. IanPG

    IanPG Well-Known Member Silver Supporter Team Nogaro Blue Audi S3

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    I'd say -
    *hold the spring
     
  13. MikeCrum1996

    MikeCrum1996 Member

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    It’s got slightly worse since I posted you can only hear it if the radio is off or your driving 25mph seems to be the worse noise but how much would a garage charge for a bearing? Or would it be easier to do it myself but I don’t have a press
     
  14. RobinJI

    RobinJI Active Member

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    That's the one! It's been a while since I've done it since to my stint of bad luck with bearings ended a while back. So thanks for jogging my memory!
     
    IanPG likes this.
  15. MrAudi2017

    MrAudi2017 Member

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    This might sound daft, but check the tyres. Had experiences in the past where a tyre had come out of shape and would feel like wheel wobble and a bearing drone albeit balance and bearings were both fine...

    Jack it up spin the tyre, make sure that it's straight...
     

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