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Old 03-09-2006, 07:30 PM   #1
BMW Guy
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Clunking sound from back

I have a 93 325is. When going over bumps I get a loud clunking sound coming from the right rear of the car. Is there any common problems with shocks and/or shock bushings wearing out? Please advise. Thanks
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Old 03-09-2006, 07:35 PM   #2
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yikes i kinda have the same issue, mine only makes the noise when going over speed bumps or out of driveways slow, i havent noticed the sound at higher speeds.... and thought maybe the subframe, but someone said that subframe failure also makes a nasty noise on hard acceleration (i have yet to comfirm how to diagnose a subframe failure though)... but i have to get the car back on the road and see for myself, it could very well be a problem with the rear shock mounts or trailing arm bushing.
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Old 03-09-2006, 08:41 PM   #3
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upper rear shock mounts, big problems with those.

Goto the dealer and get m3 ones with z3 reinforment plates
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Old 03-09-2006, 08:53 PM   #4
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Ya, more than likely its your RSM, mine are shot to hell and make a noise like all hell breaking loose at speeds above 120km!
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Old 03-09-2006, 09:33 PM   #5
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my car did that... it was my rear control arm bushings
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Old 03-09-2006, 09:39 PM   #6
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what can cause it:
1. shock mounts, you'll notice it more on bumps and potholes.
2. trailing arm bushings, while going 40km/h slam on the gas... if the bushing is gone you'll usually feel the back of the car jerk to one side.
3. subframe bushings, you'll notice the knocking whenever the rear subframe is put under stress. bumps, potholes, hard braking, hard acceleration. it's usually a very quiet THUD sound.
4. could be any one of your mounts, or differential bolts.

Also be sure to make sure your spare tire is secured, as well as your car jack. I remember I once had a small bottle that fell down there and was rolling around whenever I hit the brakes... sounded a lot like a dying RSM.

I've had a thumping sound at the back of my car since I ran over a 4x4 log at 80km/h... fell off a pickup truck right in front of me, and the car was airborn. Looks like it's a torn subframe bushing... I just have to keep tightening that subframe bolt every year or so, till I can afford to get it fixed properly.
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Old 03-09-2006, 10:48 PM   #7
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for me i my problem is that the metal panel that goes all the way under the car is rusty and in some places its broken due to rust. when the car is cold it causes it to shake and make horrible noises. dont jump the gun thinking something is truly broken. i checked everything out and everythign works, its just that stupid metal thing thats rusted
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Old 03-09-2006, 11:12 PM   #8
superman123
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if u hear that noise from the front ..with new struts
might that be bushings or mounts (didnt change the mounts when i changed the struts )(i kinda suspect those)
i hear it when i take a quick corner or some bumps
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Old 03-09-2006, 11:47 PM   #9
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I'm betting rear shock mounts. Not an expensive fix even if you upgrade them with aftermarket mounts. I've changed mine so many times I can do them both in under an hour.
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Old 03-10-2006, 12:18 AM   #10
kzy
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I had a very similiar sounding problem with my car, and thought it was something to do with my shocks as well.

Took it in to Rocco at RMP, and he diagnosed it quickly as simply a loose parking brake, so he tightened everything up, and no more clunking/rattling
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Old 03-10-2006, 12:50 AM   #11
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just did rogue rsm's and they helped to rid the car of the rear end clunk. they're nice sturdy pieces.
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Old 03-10-2006, 09:24 PM   #12
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It was the right RSM. I replaced both while I was at it. Both changed in less then an hour. Not bad. It's a quiet ride now. Thanks for your suggestions.
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