Help identify vibration/noise

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Aug 16, 2009 | 09:12 PM

pechorin75

Thread Starter

7th Gear

Joined: Jul 2008

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From: Frederick Maryland

Help identify vibration/noise

I have an '04 automatic. So far it's been great--no problems--but there's one annoying little thing that's been bugging me since I bought the car. Most of the time, when I pull away from a stop, there's a very brief low-frequency "vibration" noise that seems to come from somewhere in the rear-end of the car. Seems to be related to the speed of the engine just off idle. My guess is that it's something in the exhaust system--a shield or something vibrating against something else as the engine comes off idle--but I have no way to verify that.

Anybody else notice the same thing, or have other ideas? It's not a big deal, but it sounds kinda cheesy, so I'd like to fix it if I can.

Thanks!

Aug 16, 2009 | 10:55 PM

craigwirth

Heel & Toe

Joined: Oct 2008

Posts: 15

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From: Dallas Texas

I had a similar noise coming from mine for months. Turned out to be the a/c tensioner. $187 fix at Corvettes of Dallas. Hope yours is as cheap and easy. Good luck

Aug 16, 2009 | 10:59 PM

mstromquist

Le Mans Master

Joined: Jun 2007

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From: BEST Corn-Nation

2015 C5 of the Year Winner

If it is coming from the exhaust, you might have a catalytic converter with the guts a little loose.

Aug 16, 2009 | 11:01 PM

Stevo92z28

Melting Slicks

Joined: Apr 2007

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From: Northern VA

I bet it's the 2 springs that hold the exhaust up near the transmission. Very common rattle.

Aug 17, 2009 | 06:16 AM

Atok

Melting Slicks

Joined: Apr 2003

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From: NS

Quote:

Originally Posted by Stevo92z28

I bet it's the 2 springs that hold the exhaust up near the transmission. Very common rattle.

Is there a common fix for that? I've got that rattle on my Z06.

Aug 17, 2009 | 07:36 AM

craigwirth

Heel & Toe

Joined: Oct 2008

Posts: 15

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From: Dallas Texas

Any decent performance shop will check the the springs, as well as the cats, if you tell them you have an exhaust rattle. LG checked that first thing on mine. Unfortunately, that wasn't my issue, but they replaced half of the H pipe at no cost anyway. Good people

Keep in mind that many rattles or vibrations originating in other areas will travel the length of the exhaust

Aug 17, 2009 | 08:07 AM

Stevo92z28

Melting Slicks

Joined: Apr 2007

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From: Northern VA

Quote:

Originally Posted by Atok

Is there a common fix for that? I've got that rattle on my Z06.

http://forums.corvetteforum.com/c5-g...st-rattle.html

Aug 17, 2009 | 10:26 AM

renegad44

Safety Car

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From: This is not a Song, It's an Outburst: Or, The Establishment Blues; Sixto Diaz Rodriguez

I think I had that same problem when my LG Streets were installed, the whole package, cats/x-pipe, seems the long tubes were just a hair too close to the tunnel plate, when I took off from a stop, it moved just enough to vibrate. Brought it back and the guys corrected the problem. Hope this helps.