EXHAUST SYSTEM RATTLE (REPLACE PIPE ASSY. AND EXHAUST SEAL)

SUBJECT: EXHAUST SYSTEM RATTLE (REPLACE PIPE ASSEMBLY AND EXHAUST SEAL)

VEHICLES AFFECTED: 1993 F-CAR WITH 3.4L ENGINE (RPO L32)

APPLICATION:

----------- 1993 Chevrolet and Pontiac F-Cars

CONDITION:

--------- Some 1993 F-cars with 3.4L V-6 engines (RPO L32) and assembled prior to VIN breakpoints indicated below, may exhibit a tinny rattle type noise audible during engine warm-up between 1100 to 1400 RPM when under a moderate load. This condition can be duplicated with the vehicle in drive, service and parking brake applied and by running engine up between 1100-1400 RPM.

VIN #'s: Chevrolet: P2110926 Pontiac: P2204574

CAUSE:

----- The exhaust crossover/takedown pipe assembly is manufactured with an inner and outer pipe with an intended gap of approximately 5-6 mm between them. On assemblies where this gap has not been maintained, contact between the inner and outer pipes may occur during certain operating conditions resulting in a tinny rattle type noise.

CORRECTION:

---------- Replace existing exhaust crossover/takedown pipe assembly and seals with new components indicated below following applicable Service Manual procedures in Section 6F, Exhaust System.

Part Description Part Number Quantity ---------------- ----------- -------- Exhaust Crossover/Takedown Pipe Asm. 10247840 1 Exhaust Seal 10220451 2

For vehicles repaired under warranty use:

Labour Operation: L2080 Use applicable Labour Time

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.