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weird clunking noise- help! (archive)

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Posted by tex on February 28, 2001 at 11:33:56:

Cross-posted from Z3 Coupe board...

In the last few weeks I have been experiencing a weird low-speed clunking noise when the car goes over bumps. It's not the common clutch-out-in-first clunk; I
have that one too. Here are the symptoms:

-Only happens at speeds under 10mph over speed bumps, curb cuts, and other undulations.

-Appears to come from the front of the car, maybe underneath

-Can't really tell if it's on the left or right side

-Happens whether clutch is in or out

-at first it got worse, then it got better, now it's getting worse again, but it always gets much better when I try to demonstrate it to someone:(

The weird thing is that I recently had my shocks changed, but the noise started the night *before* the shock installation. I told them about the noise and they found
nothing loose, but afterwards it was still making the noise. The other day I had an alignment and all the major suspension bolts were checked/retorqued, including
upper strut mounts, lower mounts, subframe mounts, steering rack mounts, everything. Nothing was found to be loose. Wheel bearings are fine, brake calipers seem
fine, ball joints have no play...

I'm giving up on the idea that it's suspension related. Could it be something in the drivetrain, like the driveshaft? As I said it is vehicle speed dependent. I know it's a
longshot, but I'm just wondering if anyone has ever heard of something like this or has any ideas. TIA.

Peter
'99 Z3 2.8 Coupe


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