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Thread: Thumping noise over bumps in the trunk.

  1. #1
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    Thumping noise over bumps in the trunk.

    Hi guys,

    I bought an 530d M-sport estate a few month ago.

    Only problem I have is very loud, thumping noise when driving over a bump.

    I alredy removed almost everything I could and drove, still present.
    So far cant even imagine what can be the cause.

    First I thought it is the stupid opening glass in trunk, as it was moving and wasnt firm. Adjusted that to be very firm.

    2. Removed trunk plastic etc still present.

    I will raise the car tommorow, and see if something is hitting it from the bottom. But nothing was loose when I checked it last time.

    My catless downpipe should come anyday, maybe it is exhaust that is the cause.


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  2. #2
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    i would look at your subframe bushes to see if they are perished. there are 4 of them.

    G~
    E61 Mods: Trailer Hitch/wiring, Cargo cover roller fix, Backup camera, H&R springs, ER charge Pipe, Mishimoto catch can, boost gauge, intake scoop, JB+, CSR Rear Spoiler, Full SAT retrofit.
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  3. #3
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    Quote Originally Posted by Reefin Dude View Post
    i would look at your subframe bushes to see if they are perished. there are 4 of them.

    G~
    I will check them tommorow after work.

    Отправлено с моего SM-G935F через Tapatalk
    -E34 M60B40 + Tremec TKO 600 (sold)
    and sadly no old BMW anymore, only high powered Seat Leon Cupra 4Drive as a daily driver.

  4. #4
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    +1 on the subframe bushings.

  5. #5
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    +1 on the subframe bushings. But if you have a subwoofer in the back passenger side and it is loose it will make a clunking sound, also make sure the battery brackets are tight and the welds have not broken.
    2003 525iT Automatic, Topas Blue Exterior, Gray Leather Interior, Sports Suspension, Sports Seats, M 3 spoke Steering Wheel.
    2008 328xi E91 (wagon) Automatic, Barberatot Metallic Exterior, Terracotta Leather Interior.

  6. #6
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    It doesnt sound like the subframe I think.
    More like the trunk is not tight and is banging, but who knows. I will check the bushings.


    Отправлено с моего SM-G935F через Tapatalk
    -E34 M60B40 + Tremec TKO 600 (sold)
    and sadly no old BMW anymore, only high powered Seat Leon Cupra 4Drive as a daily driver.

  7. #7
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    do you have slide out trunk floor? these can clunk if there is not weight on them.

    G~
    E61 Mods: Trailer Hitch/wiring, Cargo cover roller fix, Backup camera, H&R springs, ER charge Pipe, Mishimoto catch can, boost gauge, intake scoop, JB+, CSR Rear Spoiler, Full SAT retrofit.
    Coded: legal disclaimer removal in iDrive, auto folding mirrors on lock, turn signals in HUD, fan speed indicator on when in auto, Doors unlock when key removed

    E39 Mods: Euro dash conversion, Dinan exhaust, Dinan suspension with Camber kit, 2.81 differential, flappy paddle with double pull M mode activation/deactivation, backup camera, Video playback on Nav computer (iPod Video for video storage and playback), stereo video playback through DSP, MKIV computer, RPA Tire Pressure retrofit, Intravee II iPod integration, Euro armrest, HUD, Parrot BT, voice recognition module, trailer hitch/wiring, rear mounted 10" subwoofer with amplifier, lighted interior door handles, Evans coolant.

  8. #8
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    Ours was a combination of worn subframe bushings and a mis adjusted rear hatch latch. ours needed tightening., If the subframe bushings have over a 100k miles on them and haven't been changed, they probably need them..

  9. #9
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    20171025_090117.jpg

    Check to see if this guy is not loose. That is what was causing noise in my trunk.

  10. #10
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    Dont have the slide out trunk, its the lifting one.

    It does have 306tkm on it, so bushings are probably dead. But one of our mechanic who also have E39 which is also M-sport but his one is individual without exterior M-sport bumpers, said his car drives much worse, and he does have bushings gone, but still no clunks :/

    I think it might be the trunk, but I adjusted it a few times so far. Have to take a look maybe cd changer or something is loose.


    Btw guys, is there poly bushings on sale? Or just the rubber ones?
    Last edited by nike32; 10-25-2017 at 03:48 PM.
    -E34 M60B40 + Tremec TKO 600 (sold)
    and sadly no old BMW anymore, only high powered Seat Leon Cupra 4Drive as a daily driver.

  11. #11
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    Quote Originally Posted by 2003540iat View Post
    20171025_090117.jpg

    Check to see if this guy is not loose. That is what was causing noise in my trunk.
    Thats the subwoofer. Mine makes clunking sounds if I do not tighten it down "completely".

    Powerflex makes urethane subframe bushings for the e39 touring. https://powerflexusa.com/E395Series97-03.aspx
    2003 525iT Automatic, Topas Blue Exterior, Gray Leather Interior, Sports Suspension, Sports Seats, M 3 spoke Steering Wheel.
    2008 328xi E91 (wagon) Automatic, Barberatot Metallic Exterior, Terracotta Leather Interior.

  12. #12
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    Quote Originally Posted by vipeboy2000 View Post
    a mis adjusted rear hatch latch. ours needed tightening.
    Is it pretty simple to tighten this? I am pretty sure my subframe bushings are shot at 222k miles and I am replacing those soon. But I think I should check other stuff, since it sounds and looks like that is what's making noise, but it could just be that's whats vibrating due to the bad bushings...
    2000 528i Touring Sport-Premium (Daily Driver)
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  13. #13
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    My bump was the battery tray. The front left weld gave out. Had a shop weld it back together:
    2016-Battery stand weld 01.jpg
    [IMG][/IMG]

  14. #14
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    Quote Originally Posted by JaxPlanet View Post
    My bump was the battery tray. The front left weld gave out. Had a shop weld it back together:
    2016-Battery stand weld 01.jpg
    Will check that! Thanks

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    and sadly no old BMW anymore, only high powered Seat Leon Cupra 4Drive as a daily driver.

  15. #15
    geargrinder's Avatar
    geargrinder is offline Having No Trouble Here BMW CCA Member
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    Its the subframe bushings.

    Sedans don't have the issue.

    Its hard to ID always from underneath but trust us... its a TOURING PROBLEM. If the bushings have small cracks in the bottom then they have leaked out all their oil inside and now are flopping all around.

    "Meyle HD" bushings are available that are not oil filled so won't do this. That is NOT regular Meyle - if it doesnt have the gold HD seal on the box its not the right part. The powerflex only became available recently so mine are the Meyle HD and they do the job fine.
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  16. #16
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    My spare tire caused bumping noise. I removed the tire and then realized the sound had stopped. Grabbed some upholstery foam, like in seat cushions and placed under the tire, fixed the noise problem.

  17. #17
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    Quote Originally Posted by Poolman View Post
    My spare tire caused bumping noise. I removed the tire and then realized the sound had stopped. Grabbed some upholstery foam, like in seat cushions and placed under the tire, fixed the noise problem.
    I have did that first thing.

    But so far the noise dissapeared, maybe its the trunk upholstery top cover, as there is now subwoofer, and catalytic converter pressing it down.



    Отправлено с моего SM-G935F через Tapatalk
    -E34 M60B40 + Tremec TKO 600 (sold)
    and sadly no old BMW anymore, only high powered Seat Leon Cupra 4Drive as a daily driver.

  18. #18
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    Quote Originally Posted by JaxPlanet View Post
    My bump was the battery tray. The front left weld gave out. Had a shop weld it back together:
    2016-Battery stand weld 01.jpg
    You have to love this one. Now that problem was caused by:
    A. Forgot to remove battery hold down bolt before removing (forcing) the battery out of tray
    B. "Ok, Hans the bracket is in, you weld it and then let it go on to painting" Overheard on the factory floor just before the Friday shift ended....
    C. "Lets see if we can make this car jump on the next hill...."

    One of my former cars (70's US domestic) came from the factory without any body sealer around the taillight panels so you could actually see daylight from inside the trunk around the lights. New car so never hit but never finished either. You have to love old factory fit finish and quality controls. "We don't need no stinking second lookers. I do a good enough job!"
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