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04-04-2009 07:53 PM #1
Z3 Coupe - RR suspension squeeking/rattling
I've got a '99 Z3 2.8 Coupe w/ around 80K miles on it. I've owned the car for about 2 years. About 6 months ago the right rear suspension area began emmitting a creaking/squeeking/rattling noise whenever I went over speadbumps, rough road, or if I sat down in the car when it was parked. This noise is very persistant and if the windows are down the noise is VERY audible. I can't figure out what's causing it. It isn't the spare tire holder. That's solid. Is it my suspension? Any thoughts?
04-04-2009 11:14 PM #2
Re: Z3 Coupe - RR suspension squeeking/rattling
It's probably either a rear shock mount, or the dreaded trunk floor separation problem.
The first problem is an easy fix, and really should be done at those miles if it's never been done anyway, but you have to disassemble the interior in the rear just to get to them. The rear shock mounts are the bushings at the top of the shocks where they mount to the body. If your shocks are original they are completely shot at this point anyway.
The trunk floor separation problem (often called "the subframe problem" even though it has little to do with your subframe) is a not-terribly-uncommon problem that can become fairly severe. If you look under your car, you'll see that the differential and the rear sway bar both mount to a tranverse metal brace under the trunk floor. Usually what happens is that the small metal ears where the diff mounts start to tear. When it gets bad, that entire transverse brace starts to pull away from the trunk floor itself on the left hand side, and when it gets really bad, the floor sheet metal starts to pull away from the longitudinal frame rails, also on the left side.
I hope it's not that. The fixes are well-known but are pretty expensive.
<a href="http://www.godoggoracing.org/">Go Dog Go Racing</a>
04-06-2009 11:46 AM #3
Maybe a stretched E-brake line?
My 2.8 coupe (113K) will rattle in the rear for two reasons these days. the e-brake and one of my sway bar mounts.
I'm pretty sure my e-brake line is stretched because one notch up on lever solves that rattle.
The sway bar attachment popped off one day at the auto-X, reattached it but its anyways rattled on bumps since then.
I also on occasion here one of my rear shock mounts rattle too, needs replacing.
I've had my sub floor checked multiple times, still solid. Look for tears and cracks around the Diff.
Has the cars handling changed at all?
04-07-2009 07:38 AM #4
04-08-2009 07:52 AM #5
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