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Old Apr 26, 2009 | 11:58 AM
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Default metallic rattling

I have a metallic rattling/sounds like something is hitting the body when I start my car up. it will rattle for a few seconds hen stop, then 20 seconds later or so come back, then when i start driving goes away, and will come back when I shift sometimes. Very odd. shitty GM quality. anyone experienced this?
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Old Apr 26, 2009 | 11:59 AM
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get under your car and hit your y-pipe. if it rattles, your cats are breaking up
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Old Apr 26, 2009 | 03:47 PM
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dont know if this will help but my jack in the spare compartment was loose and gave me the same sound you are discribing... but from rear
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Old Apr 27, 2009 | 06:56 PM
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definetly from engine bay. it will drone on for a few seconds then go away. then come then go just a few times.
Thanks for the info though. I'll tighten up the jack anyways, good to know.

car only has 48k, doubt its the cat, but ill check as well.
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Old Apr 27, 2009 | 09:38 PM
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i have a similar sound from the engine bay/under the front left tire area i keep thinking it is the y pipe but i cant find anything. i do no mine is the exhaust but i just cant track that pesky thing down. good luck with urs post here or pm me if u figure out what it is so i can check mine. i have been trying to trace this sound since sept of last year. on a lift and on jack stands just cant find it.
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Old May 11, 2009 | 02:48 PM
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I have a slight metallic grinding noise coming from under the car from what seems around the tranny area/exhaust area. It will start when its first start up or when car is cold and will go away after several miles. I park it for an hour and it comes back, I drive it a few miles back to work and its gone.
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Old May 11, 2009 | 03:58 PM
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Originally Posted by DC8808
I have a metallic rattling/sounds like something is hitting the body when I start my car up. it will rattle for a few seconds hen stop, then 20 seconds later or so come back, then when i start driving goes away, and will come back when I shift sometimes. Very odd. shitty GM quality. anyone experienced this?
M6 or auto?

In the M6, if it sounds like a quiet knocking (like a very quiet bottom end knock), it might be in your TOB/pressure plate in the transmission.
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Old May 11, 2009 | 04:56 PM
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mine was doing that after the rebuild. the y pipe was hitting that litte support. took it off and it went away
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