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Rattle sound at catalytic converter

 
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opy
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PostPosted: Mon Jun 29, 2009 10:49 am    Post subject:  Rattle sound at catalytic converter Reply with quote

I have an 05SS and there's an obnoxious rattle sound at the 2nd converter (that 3ft long long thing with the heat sheild wrapped around it). A couple of the spot welds are broke so I tried to shim up the gaps with washers and clamp the shield but it still rattles.....seems like it's coming from inside the converter. Even if I lightly tap the exhaust with the engine off, I can hear it rattle. Anyone out there have the same problem? Looks like a $500+ part but if it has to be replaced to get rid of the rattle, so be it.......it sounds like crap at idle. Thanks for the info.
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HotSauce6226
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PostPosted: Mon Jun 29, 2009 10:55 am    Post subject:   Reply with quote

I believe thats a resonator not your converted.

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PostPosted: Mon Jun 29, 2009 11:06 am    Post subject:   Reply with quote

Yeah, that's the resonator. It removes a lot of the noise before it get's the the mufflers.

They are expensive, you might be better off going with a complete cat-back system, or removing the resonator and replacing it with a pipe (will increase cabin noise)

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timpala11
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PostPosted: Tue Jun 30, 2009 1:08 pm    Post subject:   Reply with quote

A rattle or is it like a whisperish noise?

Might just be a loose connection that needs to be tightened.

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ZSPOT
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PostPosted: Tue Jun 30, 2009 1:17 pm    Post subject:   Reply with quote

Hmm... there isn't really much in there to rattle. Confused Still might be your heat shield. I would try getting some large, worm style hose clamps at the hardware store and tighten the shield to the resonator. Might be enough to fix it.

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PostPosted: Tue Jun 30, 2009 1:36 pm    Post subject:   Reply with quote

ZSPOT wrote:
Hmm... there isn't really much in there to rattle. Confused Still might be your heat shield. I would try getting some large, worm style hose clamps at the hardware store and tighten the shield to the resonator. Might be enough to fix it.

Im With Stupid

As soon as I saw the title I thought it would be a loose heat shield.
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infamous9
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PostPosted: Thu Sep 29, 2011 12:25 am    Post subject:   Reply with quote

I just took off the heat shield, mine also had spot welds missing.
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PostPosted: Thu Sep 29, 2011 7:53 am    Post subject:   Reply with quote

I have the same problem and it drives me nuts. I took off the heat shield and I replaced my res with a straight pipe years ago. When I got my new tranny last December I listened to the exhaust while the car was up. The mech and I couldn't really tell were in the line the rattle was coming from. And my cat that's on now is the 4th one. And it made the rattle before that. I have no clue but I don't have the cash for a whole new exhaust either.
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