EXHAUST MOAN/BOOM (INSTALL NEW MUFFLER HANGER ASSY.)

SUBJECT: EXHAUST MOAN/BOOM (INSTALL NEW MUFFLER HANGER ASSEMBLY)

VEHICLES AFFECTED: 1992-93 "B" MODEL AND 1991-93 CADILLAC "D" MODEL

This bulletin is being revised to add the 1991-1992 model years for Cadillac "D" cars. Warranty Administration has been notified of all changes and the warranty claims processing system has been updated.

CONDITION:

Some 1992-93 B-cars and 1991-1993 D cars may exhibit a slight exhaust moan/boom condition, most apparent during light acceleration from 45-55 mph with transmission in fourth gear and torque converter clutch (TCC) applied.

CAUSE:

Exhaust generated pulsation's transmitted into vehicle underbody through the exhaust system hangers.

CORRECTION:

Replace existing muffler hanger assembly with new assembly P/N 10228003. Follow applicable Service Manual Procedures and those noted in illustration to insure proper installation and system alignment. Torque hanger/frame bolt to 24 N.m (17 lb.ft.) and hanger clamp to 33 N.m (24 lb.ft.).

For vehicles repaired under warranty use:

Labour Time: 0.6 Hours

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.