For 1990-2009 cars

# EXHAUST MOAN/BOOM AT IDLE

#### SUBJECT: EXHAUST MOAN/BOOM AT IDLE (INSTALL EXHAUST DAMPENER ASSEMBLY)

#### MODELS: 1994-95 BUICK CENTURY SEDAN 1994-95 OLDSMOBILE CUTLASS CIERA SEDAN WITH 3.1L ENGINE (VIN M - RPO L82)

#### CONDITION:

SOME VEHICLES MAY EXHIBIT A MOAN CONDITION MOST APPARENT WHEN VEHICLE IS IN GEAR, BRAKES APPLIED, ENGINE IDLING AT NORMAL OPERATING TEMPERATURE AND UNDER A HEAVY LOAD.

#### CAUSE:

VEHICLE EXHAUST SYSTEM EXCITED BY ENGINE EXHAUST PULSE INDUCED VIBRATION.

#### CORRECTION:

FOLLOWING PROCEDURE AND ILLUSTRATION, INSTALL EXHAUST DAMPENER ASSEMBLY, P/N 10280499.

1. RAISE VEHICLE.

2. REMOVE RIGHT SIDE UPPER AND LOWER CATALYTIC CONVERTER/ INTERMEDIATE PIPE FLANGE BOLTS.

3. POSITION EXHAUST DAMPENER ASSEMBLY, P/N 10280499, AS SHOWN IN ILLUSTRATION AND SECURE BY INSTALLING BOLTS REMOVED IN STEP 2.

4. TORQUE BOLTS TO 47 N.M (35 LB FT).

5. LOWER VEHICLE.

#### PARTS INFORMATION:

PARTS ARE EXPECTED TO BE AVAILABLE ON 4/24/95 AT GMSPO.

#### WARRANTY INFORMATION:

FOR VEHICLES REPAIRED UNDER WARRANTY, USE: LABOR OPERATION: L2008 LABOR TIME: 0.3 HR.

FIGURES: 1

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.

COPYRIGHT 1995 GENERAL MOTORS CORPORATION. ALL RIGHTS RESERVED.