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Thread: Vibration at speed (70mph+) when coasting??

  1. #1
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    Vibration at speed (70mph+) when coasting??

    Trying to track down an issue I seem to be having. My car vibrates a bit when coasting at high speeds, not at low speeds at all, and not when under power at all at any speeds, just at high speed when coasting..

    Just had some new rims put on, so might be best getting a proper balance. Alignment is fine as it drives very straight.

    Bar the alignment, what else is likely?


    ch

  2. #2
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    I'd have the tires balanced again, especially if the tires are new. Do you feel the vibration in the steering wheel or in the seat? May help determine if the front or rear is causing the issues but either way, my bet is your tires are out of balance.

    Just FYI, alignments don't typically cause vibrations. They can royally mess up handling, and steering input but typically no vibrations.

    If a typical "spin" balance isn't cutting the vibration. Try to find a shop who has a "road force balancer".

    Good luck.

  3. #3
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    It can also be the rims themselves...what kind are they?
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  4. #4
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    M3 rims, with shitty spacers at the rear 5 + 2 mill spacers in the rear..

  5. #5
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    Bad tire
    drive it like you stole it

  6. #6
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    It works out that critical resonance of car tires happens at ~35 and ~70 mph. You either have a balance issue or something like a broken belt. Broken belts will show up in funky tire wear.

    Could also be a bad damper, wheel bearing, LCAB or suspension ball joint. Those are checked by jacking the car and yanking on a tire to check for play. Any movement (other then locking up the steering rack) is bad. Front wheel bearings will make a "loose marbles" sound when bad.

    Outside chance that it's the guibo or other issue with the prop shaft. Bad ones start to fray and have lots of cracks in them.
    Last edited by osborni; 10-15-2012 at 09:55 AM.
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  7. #7
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    Check tire pressures.
    Phil

  8. #8
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    Bent rim can also be an issue. I've changed all items in the front (bushings, tie-rods, suspension, even tires). It helped reduced the vibration, but my one front bent wheel still causes a slight shake and shimmy.
    If not a bent rim, definitely try to get a good rebalance. I've stopped going to my usual tire places because I've found other places with better balancing machines and better technicians.
    Last edited by AutoM3otives; 10-15-2012 at 02:48 PM.
    M3 E30 | 190E-16V | M Coupe E36/8 | S2000

  9. #9
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    I understand it could be a bent rim or tire unbalance... However if that was the case, it would be a persistent shimmy/shake???
    Not just under coasting??? As it is not present under acceleration...????
    Oh I should add, not certain if it did or did not do this before the rim change as I pretty much did that (the rim change) when I got the car...
    Last edited by vanne; 10-21-2012 at 02:55 AM.

  10. #10
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    Have you checked your front brakes? The disks might be bent, or the calipers not working smoothly. Secondly have you checked your wheel bolts? When loose, even al little bit, it will cause vibration! Finally, have you cleaned the wheel hub before mounting the new rims?

    1996 BMW Z3 1.8 Roadster
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  11. #11
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    You really have to tell us where you feel the vibration most.

    That way we can determine what part we think could be affecting it.

  12. #12
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    Did it have the vibration before you had the new wheels installed? Do you still have the old ones? If you still have the old wheels and tires, put them back on and see if you still have the vibration. If not, it is in the new wheels/tires/spaces; if so, then it is in the drive train/suspension/brakes/motor (trans) mounts. The new wheels/tires/spacers are most suspect, but the vibration only occurring when not under load tends towards drive line and motor/trans mounts. Describe the vibration and conditions of occurrence in greater detail.

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