Muffler - Louder Than Normal Exhaust

NUMBER:
92-T-159

CORP.REF.NO:
266603

DATE:
December 1992

SECTION:
6F



SUBJECT:
L35 MUFFLER TONE QUALITY - DIAGNOSE/INSTALL RETUNED MUFFLER


MODELS/YEARS:
1992 BRAVADA WITH 4.3L (VIN W) ENGINE



Some 1992 Bravadas with the 4.3L (VIN W) CPI engine built before vehicle number N2710107 may exhibit a louder than normal exhaust noise. A retuned muffler, P/N 12541384 and clamp P/N 15595048 will reduce the amount of audible noise. These parts are currently available from GMSPO.

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 the service manual section 6F Exhaust System for additional information.