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Thread: Wheel Vibration/bump bump bump When Slamming the Gas pedal

  1. #1
    Join Date
    Mar 2006
    Location
    Maryland, Virginia, D.C.
    Posts
    705

    Default Wheel Vibration/bump bump bump When Slamming the Gas pedal

    OK, So I think I know what the cause is, but I just wanted to make sure I'm not out in left field. I have a 1994 530i with the originial OE springs and new OE sachs shocks. I think my springs may be causing this, bit I'm not completely sure.

    When I slam the gas pedal on this V8 I hear the right rear tire sound like its grounding out on the fender- and bump,bump,bump,bump and then stops when it levels out. Is this a pretty clearcut case of crap springs? Anything wierd on the backend that I should poke at?.. that didn't come out right. Any other components that would cause a bottoming out at quick acceleration, or is replacing the springs gonna fill the bill. Thank you.

  2. #2
    Join Date
    Mar 2005
    Location
    Hockinson, Washington
    Posts
    2,499

    Default

    Wheel hop?
    Lowered with blue h&r(?) springs, Bilsteins, tint, 19# design 3 injectors, Dual Magnaflow
    southwest WA

  3. #3
    Join Date
    Dec 2003
    Location
    Eastern Tennessee USi
    Posts
    14,839

    Default

    maybe with NoS...lol
    Quote Originally Posted by Alexlind123
    Wheel hop?
    dude inspect it and see whats up, kinda sounds like a CV joint or guibo.
    95 E34 530I V2.37
    ===========
    Those who make peaceful revolution impossible will make violent revolution inevitable.

    John F. Kennedy

  4. #4
    Join Date
    Oct 2004
    Location
    Honolulu
    Posts
    3,105

    Default I had a simular problem

    turned out to be the eight 1LB propane tanks I had in the trunk.


    Vee ave vays of dealing vid your kind...........

  5. #5
    Join Date
    Mar 2006
    Location
    Maryland, Virginia, D.C.
    Posts
    705

    Default

    It sounds more like the wheel is hitting the top of the wheel well. But I can't see it because I'm driving. Is this what a bumpstop is for?

  6. #6
    Join Date
    Mar 2006
    Location
    USA
    Posts
    1,839

    Default

    yes, but it shouldnt hit the bump stop if you are just accelerating, unless the shocks are dead.

    it could be one of the moto.........

    sorry, just read your post again, the rear end is dead!

  7. #7
    Join Date
    May 2006
    Location
    Perth Western Australia
    Posts
    438

    Default

    Subframe bushes?

    CV?

    Guibo?

    Check those first!
    BMW parts professional

    Previous rides:
    BMW
    E12 M535i (go the dogleg!)
    E28 M535i (MMM M88!)
    E34 535i M

    MAZDA:
    RX7 S-IV T04 (440 hp ATW)
    RX7 S-I 13b bridge port
    RX4 13b peripheral port

  8. #8
    Join Date
    Jan 2004
    Location
    Sydney, Australia
    Posts
    104

    Default Yep- I agree, subframe bushes or centre bearing

    Check the subframe bushes. Put the rear on ramps, take the plate off that covers the subframe bush on the side that makes the noise, then jack the car (body) up at that point as high as you can.
    Inspect the subframe bush, it should be still nice and round and fully intact. If it has twisted and looks to be coming apart -it is.
    If not, while the car is kacked up, slip you fingures between the top of the subframe bush and the car body. If there is sticky rubber, thats becuase the thump is the subframe bush hitting the car body under the rear seat. Either way, time to replace. - Check the dogbones while your under there too.

    If not (and with the car only 10+ years they should last longer), try checking the other items Ausmpower suggested, as well as the centre drive shaft bearing. If the rubber around the centre bearing housing has failed, the driveshaft will distort under acceleration and the shaft bangs on the support surround. This feels more like its hitting under the drivers deat than the rear seats though.

    If not any of the above - back to the spings or the shock mounts.


    John 535is (now with new dogbones, centre bearing and subframe mounts).

  9. #9
    Join Date
    Mar 2006
    Location
    Maryland, Virginia, D.C.
    Posts
    705

    Default

    Thanks guys. I know what to look for now.

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