Anyone out there with an exhaust rattle?? I had it in my coupe, and also have it in my Z06. After doing a little research (and with the help of an insider) I found that this is a known problem with a TSB issued for the fix. So, for those of you like me that have wondered what that annoying rattle is, here is the info:


"Do you have details on TSB 03-06-05-005 that addresses Z06 exhaust rattles?? Mine rattles and I need info on the remedy.
Thanks,
Greg"




Greg,

Here is a copy of that bulletin. Also the superceding bulletin for the repair.

Advance Service Info - Jingle Type Noise Coming from Exhaust System (Fix Not Yet Available) #03-06-05-005 - (Apr 14, 2003)
"Jingle" Type Noise Coming from Exhaust System (Fix Not Yet Available)
2002-2003 Chevrolet Corvette

Condition
Some customers may comment that a "jingle" type noise can be heard coming from the exhaust system. The noise is similar to the sound made by shaking a key ring. This noise occurs most often on a deceleration.

A technician may be able to determine that the noise is coming from the "H" pipe area of the exhaust system.

Correction

Important
DO NOT replace any exhaust system components. Replacing components will not correct this condition. The noise is not an indication of anything being loose or broken.


Engineering is currently developing a permanent fix. Once the fix is available, this bulletin will be revised.

Dealer Action
Record the customer information on a permanent record so you may call the customer when a repair becomes available.
Advise the customer that a repair is in test and validation and is due out soon. At the time the bulletin becomes available, it will be the dealer's responsibility to contact the customer.


GM bulletins are intended for use by professional technicians, NOT a "do-it-yourselfer". They are written to inform these technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions, and know-how to do a job properly and safely. If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See your GM dealer for information on whether your vehicle may benefit from the information.
WE SUPPORT VOLUNTARY TECHNICIAN CERTIFICATION


© Copyright General Motors Corporation. All Rights Reserved.


--------------------------------------------------------------------------------
Document ID# 1297645

Jingling Noise on Deceleration or Coast Down (Section and Replace Intermediate Exhaust) #04-06-05-006 - (Jun 15, 2004)
Jingling Noise On Deceleration or Coast Down (Section and Replace Intermediate Exhaust)
2002-2004 Chevrolet Corvette

Condition
Some customers may comment on an undesirable "jingle" or "jingling" type of noise when decelerating. The noise is similar to shaking a key ring. This condition is most prominent at the mid- to high-rpm range. This noise may also be noticed when driving next to a cement wall or other barrier that will deflect sound.

Cause
This noise is coming from the "H" pipe area of the exhaust system. The center part of the "H" is formed by a crossover pipe connecting the left and right exhaust pipes. At this point, turbulence builds up in the exhaust system and may produce a jingle noise.

Correction
A service section of the exhaust has been released that incorporates a revised crossover pipe. You will need to cut the original exhaust behind the catalytic converters as described in the procedure below.

Caution: This procedure requires metal cutting. You MUST wear protective goggles and gloves.

Raise and suitably support the vehicle.
Locate the exhaust system crossbrace, located ahead of the catalytic converters. You will need to mark the exhaust pipes based on the measurements as shown in the illustration. In order to make accurate measurements, please note the following:
• Measurements need to be made from the forward edge of the crossbrace welded to the pipes.

• The most accurate measurement can be achieved by running a measuring tape between the catalytic converters rather than over them down the length of the pipe. In order to measure over the converters, you will have to arc the tape which will result in an inaccurate measurement.

The driver side exhaust pipe should be measured and marked for cutting at 80.1 cm (31.5 in).



The passenger side exhaust pipe should be measured and marked for cutting at 75 cm (29.5 in).
Using an electric or air powered reciprocating saw, cut the exhaust pipes at your marks. It is important to cut the pipes as straight as possible. Use caution not to let the blade cut into the floorpan above the pipe.
Remove the rear exhaust hanger from the cut intermediate section of the pipes.
Support the pipe with your hand and remove the two bolts from each rear exhaust flange.
Discard the sectioned exhaust pipes.
Notice: You must make sure that no burrs remain at the cut point. In addition, the area up to 18 cm (7 in) back from the cut should be clean, smooth and free of metal fragments or burrs. Failure to properly prepare the surface may result in an exhaust leak.

Examine the cuts on the front section of pipe that will be retained. You must make sure that no burrs remain at the cut point.
Install the intermediate exhaust pipes with clamps loosely attached onto the original front section of the exhaust.
Install the exhaust gaskets and secure the new intermediate pipe with two bolts to each rear exhaust flange.

Tighten
Tighten the flange bolts to 20 N·m(15 lb ft).

Install and secure the rear exhaust bracket hanger.



Position the exhaust clamps as illustrated, allowing for road clearance. Tighten the clamps.

Tighten
Tighten the exhaust clamps to 44 N·m(32 lb ft).

Lower the vehicle.
Verify the alignment of the exhaust tips and start vehicle.
Raise the vehicle and check for exhaust leaks.
Lower and turn off vehicle.
Parts Information
Part Number
Description
Qty

10345549
Gasket, Exhaust --Rear flange
2

10276792
Clamp, 2 1/2" Exhaust
2

10352196
Pipe, Intermediate (Service Section)
1


Parts are currently available from GMSPO.

Warranty Information
For vehicles repaired under warranty, use:

Labor Operation
Description
Labor Time

L3504*
Pipe, Intermediate Section -- Install
0.6 hr


Hope this helps someone.

 

Hmmm, Never heard any Jingling from my exhaust, Some rumbling maybe....but no jingling!!

 

I don't experience that symptom (2001 here).. but this is an AWESOME post..

- Matt

 

I did, and adjusted my tips a little, no more "jingle"

 

I also have a jingle, but get this... I have an 02 vert with a Z06 Ti rear section that I purchased on eBay. No jingle when I first installed it. Then I had a bunch of work done including long tubes and x-pipe. NOW I have the jingle. Happens at just about 2150 rpms on the nose. So it's a resonance thing? Anyway, took it to my tuner to get looked at and it didn't replicate, but I think that is because they tried to replicate it while on a lift. Still does it plenty and annoys the poop out of me.

Nothing is loose. O2 sensors are snug. But I can't see how this bulletin could relate to me since I'm using aftermarket parts. Unless it has to do with the hanger itself as it connects with the car? I didn't understand that part too well....then again it is late.

Maybe I need to check the exhaust tips, though I thought they were welded on?

Any ideas?

Thx for posting this!!!

 

Thanks for sharing this info. I'll bet this noise would get annoying after a while. Notice that it says dealers are responsible for notifying customers that have complained about this. Wonder how many people are still waiting to be notified?

 

I can tell you, this rattle is annoying as hell. During decel the car sounds like a bucket of bolts waiting to fall off. I spoke with a local dealer about the rattle, and his response was "never heard of that before". I told him that it occurred on both of my C5's and I didn't know what that sound was. That's why I wanted to find this bulletin. When I take it to a dealer for the "fix", I'll have a copy with me.

 

I have an 03 Coupe and had a jingle that was coming from the loose metal collars that were on the O2 sensors wires. I put some high temp RTV on the metal collars and that cured my jingle.

 

Smokey

I would check the the gasket between the longtube and where the cat- back meets just before the rear axle. I had a similar symptom and it turn out to be a blown gasket.

 

Thx Rob! I'll check it out.