S10/T10 Blazer 4WD V6-262 4.3L VIN W CPI (1992)
Muffler: All Technical Service Bulletins
Exhaust System - Louder Than Normal Exhaust Tone
Number: 92-339-6F
Section: 6F
Date: DEC. 1992
Corporate Bulletin No.: 266603
ASE No.: A1, A8
Subject:
L35 MUFFLER TONE QUALITY
Model and Year:
1992 S/T TRUCKS WITH 4.3L (L35) ENGINES
Owners of some 1992 S/T Utility vehicles with 4.3L CPI engines (L35) built before the VIN breakpoints listed below may comment on louder than
normal exhaust noise. A retuned muffler is currently available which will reduce the amount of audible noise.
VEHICLES INVOLVED:
Pontiac West Assembly Plant:
Built Before VIN
1GNCT18W8N0151461
Moraine Assembly Plant:
Built Before VIN
1GNDT13W4N2204849
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 S-10 Blazer Service Manual section 6F Exhaust System for additional information.
SERVICE PARTS INFORMATION
Part Number
Description
12541384
Muffler - 2 Dr. and 4 Dr. Blazer
15662532
Tailpipe - 2 Dr. Blazer
15662531
Tailpipe - 4 Dr. Blazer
15595048
Clamp - 2 Dr. and 4 Dr. Blazer
Parts are currently available from GMSPO.