13 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHHelp diagnosing and eliminating a rattling noise
Reported or suspected cause
exhaust tip
Reported cause
No successful repair reported for this finding.
1
Identified cause
0
Suspected cause
0
Reported fixes
Read evidence and context
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Discussions that report identifying a cause
1
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Reported cause
It turned out to be the exhaust tip on the driver's side.
Leading evidence: 'exhaust tip' (1 discussions report identifying this cause; no attributable repair resolution). Across 1 matching discussions, the most frequently mentioned possible cause is 'exhaust tip' (1 discussions; 1 report identifying it and 0 suggest it). The most frequently discussed action is 'Replace fastener' (1 discussions). For that action, 0 discussions report a resolution and 0 report an unsuccessful attempt. No action has an explicit, attributable resolution report under the current rules. These are forum reports and suggestions, not a confirmed diagnosis.
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1
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Suggestion
Hate to rain on your parade but you should have replaced the fastener with new.
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13 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
Rennlist: 1 discussions
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Generation: 20261026T220748Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
It's definitely coming from the driver side of the rear bumper cover. I'm pretty sure it's that thin aluminum (or whatever metal it is) that is in between the muffler and the bumper cover (almost like a heat shield). It rattles when the car is revving under 1000 rpm. Is there anything I can do to fasten that metal better? What holds it in there? I haven't removed the bumper cover to look at it yet. Does anyone have any diagrams showing the related parts?
Thanks!
I have this exact same problem on my 1999 C2 since the temperature dropped to 6 degrees here in Southeastern Wisconsin. I think I am going to remove the exhaust system and bumper cover to find out what is loose. The heat shields aren't exactly easy to access with both in place.
The car was fine in the warmer months and has a brand new exhaust system.
I would also be interested in any bumper removal procedures or fixes to the problem.
Thanks,
Nick
This noise is definitely the heat shield. When the car isn't even running, if you tap the bumper cover, you can hear the rattle (on the one side only). I'm just curious to know how it is attached or secured.
also make sure its not an exhaust hanger. I had a similar rattle recently, so I crawled underneath and put a rubber mallet to things to see what made noise (gently of course). It helped locate the issue...
take it to a custom exhaust shop. You know the one, The one all the USA muscle car guys use. They will fix it and do a very nice job. AND do it cheap.
Other than that. Turn up the radio?
Ok I went under the car this afternoon determined to find the noise.
I would say it is not really a rattle - it is more an intermittent chatterinng noise. Like a very fast metallic prrrrrt sound at the moment when I depress the throttle and disappears right after that.
Very annoying.
It turned out to be the exhaust tip on the driver's side. I hit the tip and it duplicated the sound.
But the bolt holding onto it was rusted and barely turned so I WD40'd the bolt and nut, removed it, treated it, and put it all back together.
Noise is gone.
Good job as far as you went with it.
Hate to rain on your parade but you should have replaced the fastener with new. And any other related hardware fasteners as well. If one is loose worn rusted enough to rattle chances are more are or soon will be.
Sincerely,
Macster.
agreed - but I plan on installing the fabspeed dual tips :-)
I looked under the car and I couldn't see how I could possibly reach the clamp that holds the current pipe/tip assembly in place. Any ideas?
