2002 - 2004 Corvette: Service Bulletin: Jingling Noise On Deceleration or Coast Down (Section and Replace Intermediate Exhaust)

Service Bulletin #: 04-06-05-006

Date: 3/30/05

Subject: Jingling Noise On Deceleration or Coast Down (Section and Replace Intermediate Exhaust)

Model(s): 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.

10345549 Gasket, Exhaust --Rear flange 2

10276792 Clamp, 2 1/2" Exhaust 2

10352196 Pipe, Intermediate (Service Section) 1

General Motors bulletins are intended for use by professional technicians, not a "do-it-yourselfer". They are written to inform those 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 a General Motors dealer servicing your brand of General Motors vehicle for information on whether your vehicle may benefit from the information.