Exhaust - Noise/Growl From Muffler

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GMC NUMBER: 92-6F-52

GROUP: 6F Engine Exhaust

DATE: February 1992

CORPORATE
NUMBER: 166606


SUBJECT: NOISE/GROWL FROM MUFFLER (REPLACE MUFFLER)

MODELS: 1992 S/T FOUR-DOOR UTILITIES (JIMMY) WITH 4.3L TBI ENGINE (VIN CODE Z)


Some owners of 1992 S/T four-door utility vehicles with a 4.3L TBI engine (VIN code Z) built between the VIN breakpoints listed below may experience loud or noisy mufflers. This is due to the muffler's tuning tube being built out of manufacturer's specifications. To correct this condition, replacement of the muffler is required.

VEHICLES INVOLVED:

Make VIN
GMC From SOP 1992 to N2503917
Chevrolet From SOP 1992 to N2113412
Oldsmobile From SOP 1992 to N2701149

SERVICE PROCEDURE:

REMOVING EXHAUST PARTS

CAUTION: Always wear protective goggles and gloves when removing exhaust parts as falling rust and sharp edges from worn exhaust components could result in serious personal injury. Using a penetrating oil on the threads of U-bolts can assist in the removal of the exhaust components.

INSTALLING EXHAUST PARTS

When installing a new muffler and tailpipe on any model, check for proper alignment. Rattles and noise vibrations in the exhaust system are usually caused by a misalignment of parts. When aligning the system, leave all bolts or nuts loose until all parts are properly aligned, then tighten, working from the front to rear.


Exhaust system hangers, hanger brackets, and clamps which are damaged should be replaced to maintain exhaust system alignment. Refer to X-9229 Sonoma and Jimmy Service Manual section 6F Exhaust System for additional information.

SERVICE PARTS INFORMATION:

Part Number Description
15662525 Muffler
15662531 Pipe Assembly
15595048 Clamp

Parts are expected to be available on 2/10/92. In case of limited inventory, parts will be placed on 400 control to waive VIP surcharges. Only verifiable emergency orders will be accepted. SPO will make every effort to obtain parts. However, the part will be shipped premium transportation at the dealer's expense and all other order types will be placed on backorder until the 400 control is removed.

WARRANTY INFORMATION:
For vehicles repaired under warranty use:
Labor Operation: L2584

Labor Time: 0.4 hrs.