2000 Camaro undercarriage rattling - Team Camaro Tech
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post #1 of 11 (permalink) Old Apr 15th, 03, 08:09 AM Thread Starter
 
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Hi,

I was hoping someone might be able to help me out here. I know this tech forum is geared toward older Camaros, but I thought I'd post this anyway since I am running out of things to try.

I have a 2000 Camaro V6 (5-speed manual) with 37,000 miles on it. Recently the undercarriage began a slight rattle, like a metal on metal sound, which has steadily been growing worse. Of course, it's intermittent and hard to tell exactly what it's coming from, but lately it's getting worse almost to the point of a rattle/grinding sound.

The times it occurs most often is at low idle when pressing down the accelerator, or around 2,000 RPMs for a brief moment or two. And usually it is most obvious when the car has been parked (engine off) for a while.

I thought it might be the catalyic converter and took it to a Chevy dealership to have it looked at. Of course they tested the cat and everything showed up fine, and they insisted they couldn't hear any rattling (they did a road test too) -- probably cuz the problem is intermittent and not always audible every time the engine is running.

Anyway, I'd appreciate if any of you might have ideas as to what this could be. Drive-train maybe? Muffler, exhaust piping loose?

I'd like to get a better idea of what might be wrong before taking it to another shop for a second opinion... Thanks for any help you can provide! (Or if you have suggestions of other Camaro tech forums geared toward recent model Camaros, please pass those along too...)

-Dan
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post #2 of 11 (permalink) Old Apr 15th, 03, 09:26 AM
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Do you hear the noise when your foot is on the brake? I've had problems with many vehicles with the brake pads rattling around in the calipers.
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post #3 of 11 (permalink) Old Apr 15th, 03, 10:18 AM Thread Starter
 
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Nope - no sound or problems are audible when the brake is depressed. I've tried to get below the car as far as possible while still being able to press the accelerator (had to use a broom stick to press the gas while leaning around the edge of the camaro!) and it sounds like the rattle/grind is coming from the middle undercarriage area when gas is applied -- around the drivetrain/cat converter area, which is why I initially thought it was the cat failing (although chev dealer tests ruled that out)...

-Dan
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post #4 of 11 (permalink) Old Apr 15th, 03, 10:33 AM
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Loose heat shield(s)would be my guess.

I'd say crawl under there with a 7mm socket and start tightening all of them, and check all the rubber hangers while you're at it.

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post #5 of 11 (permalink) Old Apr 15th, 03, 01:52 PM
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had the same thing with my 2000 SS ,it endedup being the cat(one) covered under warrenty too!

good luck!
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post #6 of 11 (permalink) Old Apr 15th, 03, 02:41 PM Thread Starter
 
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Fastorange67 --

Very interesting you say that about your SS! Because I've already had 1 cat replaced on my Camaro. Exactly 1 year ago at 18,000 miles, I had these same symptons. I went to the Chev dealership and sure enough, they had to replace the cat (under warranty back then).

Now -- exactly 1 year and another 18,000 miles later, I'm having the same symptons (which is why my initial theory was that the cat was going bad again). But this time the same Chev dealership said (last week) there was nothing wrong with the cat and that nothing rattled when they road tested it.

If it is the cat again, then obviously something's wrong in the engine ahead of the cat and the dealership misdiagnosed the problem the first time. I told the dealership this but that didn't seem to make a difference to them. (Of course, my warranty just expired at 36,000 miles about 3 weeks ago, now this happens... argh...)

All of this is why I'm seeking other opinions before I either go back to the same Chev dealer, or take it to a different Chev dealer or shop that specializes in Camaros...

-Dan
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post #7 of 11 (permalink) Old Apr 15th, 03, 02:58 PM
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Definately one of the heat shields. Either bent and hitting the exhaust or loose.....

Steve -
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post #8 of 11 (permalink) Old Apr 16th, 03, 01:06 AM
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Quote:
Originally posted by vetsac:
... (Of course, my warranty just expired at 36,000 miles about 3 weeks ago, now this happens... argh...)

-Dan
If it is the catalytic converter, I believe the emissions components are guaranteed for far more than 3/36. I'm thinking it might be 10/100, but don't quote me on that.
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post #9 of 11 (permalink) Old Apr 16th, 03, 08:49 AM Thread Starter
 
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Spames -

Oh yeah, I completely forgot about the emission portion of the warranty. (I checked and it's 8yr/80k (including cat)).

I was able to sort of get under the car today and check for loose stuff (heat shield, etc.) but I didn't really find evidence of anything loose. Of course it's hard to tell without any lifts to raise it up...

I found a Camaro specialist shop here in town so I'll be taking it there early next week to see what they think. I'll post any findings here in the chance it might help someone else out with a similar rattle problem...

Thanks for the ideas!
-Dan
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post #10 of 11 (permalink) Old Apr 21st, 03, 10:41 AM Thread Starter
 
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Hey guys,

Well the rattle turned out to be a loose bracket harness around the tailpipe. The tailpipe was basically coming loose and out from the back end of the camaro... So it was an easy and cheap fix!

Thanks again for your comments and theories! This tech forum is very helpful!!

-Dan
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post #11 of 11 (permalink) Old Apr 21st, 03, 02:54 PM
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Thanks for letting us know Dan, many times, we never hear back. [img]graemlins/boring.gif[/img]

Glad it was just something minor.

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