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Old Jun 26, 2007 | 04:03 PM
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If anyone can help. I have a 1989 Corvette that gets a rattle when it warms up. It sounds like it's under the car.

Thanks in advance
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Old Jun 26, 2007 | 04:13 PM
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It is under the car...and on the dash and in the seats....hello...it's a corvette.....
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Old Jun 26, 2007 | 04:37 PM
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I'd say it's the catalytic converter coming apart if the rattle is under the car.

And yes that's my final answer

Gary

Last edited by flyinlow90; Jun 26, 2007 at 04:55 PM.
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Old Jun 26, 2007 | 05:15 PM
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You'll have to go under there and check. It could be something benign like the air tube to the cat, a loose heat shield, or something serious like rod knock from a spun bearing.
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Old Jun 26, 2007 | 05:34 PM
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Auto or six speed? (six speeds can rattle like #@#$). Otherwise I'd go with the cat too.
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Old Jun 26, 2007 | 08:41 PM
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my 89 had a rattle that sounded like it was under the car, turned out to be a the water pump pully wobbling...its worth a look see.

Other than that...the visor rattles, the door, the seat..the side mirrors, the dash, the 6 speed, the widnows, the center caps the mufflers, the on..and on...and on......

Last edited by Chris44m; Jun 26, 2007 at 08:43 PM.
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Old Jun 26, 2007 | 08:57 PM
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Everything on my car rattles. I want to get some sound deadening material from midamerican to help hush the door rattling when I hit bumps and help keep the window tapping from sounding so loud.
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Old Jun 27, 2007 | 09:20 AM
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If it rattles when it's warmed up and it's under the car it's probably exhaust. Check your hangers and your clearances.
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Old Jun 27, 2007 | 09:27 AM
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Originally Posted by revival1
If anyone can help. I have a 1989 Corvette that gets a rattle when it warms up. It sounds like it's under the car.

Thanks in advance
Does this question mean there are C4s that don't rattle?
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Old Jun 27, 2007 | 09:34 AM
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Originally Posted by DaleD
Does this question mean there are C4s that don't rattle?
If I sit in mine and don't breath without the engine on,mine doesn't rattle!!
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Old Jun 27, 2007 | 09:35 AM
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Originally Posted by DaleD
Does this question mean there are C4s that don't rattle?
HuH????

Mine doesn't rattle.

At least that I can detect.
(I only have 30% of my hearing left)
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Old Jun 27, 2007 | 09:45 AM
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Originally Posted by Chris44m
Other than that...the visor rattles, the door, the seat..the side mirrors, the dash, the 6 speed, the widnows, the center caps the mufflers, the on..and on...and on......
Very good chance its the heat shield around the cat
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Old Jun 27, 2007 | 01:47 PM
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..i have an 88 and i started getting a rattle when i would raise the rpms...it too sounded like it was coming from underneath the car....

....i tracked it down to the aluminum cover that mounts with 3 torx screws that is over the distributor!...it somehow (even while tight) would resonate....

...so, i merely took a large "o" ring (maybe 1 1/2'' dia) and placed it under the aluminum "cover" and on top of the plenum, tightened the screws down again and voilà, no more "rattle".....
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