Exhaust rattle help
Thread Starter
Instructor
Joined: Nov 2000
Posts: 155
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From: Appleton Wi
Exhaust rattle help
I have 2006 base coupe with stock mufllers. When I push up and down on the left muffler tips, there is a metallic banging sound. For the life of me, I can't see anything hitting. Everything is tight, all connections are in place. Every time I begin to move the car, I get a clank from that area, and again if I let up on the gas. sometime I get the clank for no obvious reason, probably a chasis change of some kind. Anyone experience this? any idea where its coming from. It is definately the muffler somehow. It is not the famous differential noise. thanks.
Race Director
Joined: May 2006
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From: SOFLA
2016 Corvette of Year
2015 C6 of Year Finalist
There is a hanger that goes up behind the rear fascia, I think it is a 10mm bolt that goes through a metal hanger. When it works loose it has that metal clanging. You will need to lay on your back and look up directly above the tips behind the rear bumper (fascia)
Thread Starter
Instructor
Joined: Nov 2000
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From: Appleton Wi
thanks for the reply. I'm not sure I see what you're talking about. Each muffler has a hanger welded to each side of the muffler at the back. Each hanger hooks into a rubber throuhg a hole in the rubber. Are talking about the bolt that holds the rubber on?
Race Director
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From: SOFLA
2016 Corvette of Year
2015 C6 of Year Finalist
yes, if you lay on your back and look up, the two prongs from the muffler that hold it up at the rear. My bolt was loose and was making the clanging sound you mentioned. If you lay under and move each one see if that is where the noise is coming from.
Safety Car
Joined: Nov 2007
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Also look to the middle spring hangers in the tunnel area. 2 metal springs that have metal to metal contact at both ends. these guys made noise on our 08 coupe until I "corrected" the problem with stainless steel tie wraps, and added the necessary tension to them. Sounded like a tin can when releasing the clutch on slow starts.
Thread Starter
Instructor
Joined: Nov 2000
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From: Appleton Wi
Its getting ready to rain. I'll put up on the lift tomorrow and see if either of these ideas work. Sounds like they're on the right track. Anxious to try it. Lousy rain. We've had 13" in 8 days .
Thread Starter
Instructor
Joined: Nov 2000
Posts: 155
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From: Appleton Wi
Neither of these ideas worked. It is really strange. I move the left muffler left and when I move it back right I get a rather lous metal bang. But nothing is hitting, nothing is loose. It almost sounds like it is coming from inside the right muffler, but that doesn't make any sense either. Any more ideas?
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Race Director
Joined: Oct 2005
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From: Saint Albans, WV
Also look to the middle spring hangers in the tunnel area. 2 metal springs that have metal to metal contact at both ends. these guys made noise on our 08 coupe until I "corrected" the problem with stainless steel tie wraps, and added the necessary tension to them. Sounded like a tin can when releasing the clutch on slow starts.
Melting Slicks
Joined: Jun 2007
Posts: 2,673
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From: Upstate New York
I'm just going to add some pics to show what everyone is talking about:
These are the springs at the midpipe, make sure they are still connected:
These are the hangers at the back of the muffler. Make sure the bolts are tight and that the muffler nubs are actually in the hangers.
Since you have stock mufflers it would be kind of strange for the 'over the axle' pipe to be hitting anything because it's 1 piece (unlike the one shown) but maybe a combination of a loose muffler clamp and loose hanger could cause it to shift...unlikely but....
make sure you have clearance in there:
These are the springs at the midpipe, make sure they are still connected:
These are the hangers at the back of the muffler. Make sure the bolts are tight and that the muffler nubs are actually in the hangers.
Since you have stock mufflers it would be kind of strange for the 'over the axle' pipe to be hitting anything because it's 1 piece (unlike the one shown) but maybe a combination of a loose muffler clamp and loose hanger could cause it to shift...unlikely but....
make sure you have clearance in there:
I'm having the same issue as the OP. Thanks for the pics LMB-C6, i'll look at those areas tomorrow morning. I have the Corsa Sports btw.
Racer
Joined: Apr 2008
Posts: 375
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From: Houston Texas
Also look to the middle spring hangers in the tunnel area. 2 metal springs that have metal to metal contact at both ends. these guys made noise on our 08 coupe until I "corrected" the problem with stainless steel tie wraps, and added the necessary tension to them. Sounded like a tin can when releasing the clutch on slow starts.
Heel & Toe
Joined: Sep 2010
Posts: 18
Likes: 11
muffler popping sound
Had the exact same popping sound from the passenger rear muffler - nothing hitting, not a rattle sound but a popping when you physically move the muffler. I know it doesn't make sense but I put WD-40 over the muffler hangers and rubber connections and can no longer duplicate the popping sound.
Race Director
Joined: Sep 2002
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From: Youngstown Ohio
7th Gear
Joined: Oct 2012
Posts: 7
Likes: 1
From: Canyon Lake, CA
Exhaust rattle
I've got the same thing. Sounds like rattling keys around 2,800 RPM. Very annoying. I'm not clear on the stainless steel zip ties. What part is being tensioned?
