EXHAUST MOAN AT IDLE (INSTALL WASHERS). Buick Century 1994

SUBJECT: EXHAUST MOAN AT IDLE (INSTALL WASHERS)

MODELS: 1993-94 BUICK CENTURY 1993-94 OLDSMOBILE CUTLASS CIERA WITH 3.3L V6 (RPO LG7) OR 3.1L V6 (RPO L82) ENGINE

CONDITION:

SOME OWNERS MAY EXPERIENCE AN EXHAUST MOAN APPARENT WHEN VEHICLE ENGINE IS IDLING IN EITHER PARK, NEUTRAL OR REVERSE.

CAUSE:

OXIDATION CATALYTIC CONVERTER ASSEMBLY AND INTERMEDIATE PIPE ASSEMBLY FLANGE ANGULARITY RESULTS IN PUTTING THE FLEXIBLE MEMBER OF THE CONVERTER HANGER ASSEMBLY IN COMPRESSION.

CORRECTION:

INSTALL TWO (2) FLAT WASHERS, P/N 3790768, BETWEEN CONVERTER HANGER ASSEMBLY BRACKET AND INTERMEDIATE PIPE ASSEMBLY FLANGE AS SHOWN IN ILLUSTRATION.

SERVICE PROCEDURE:

1. RAISE VEHICLE

2. REMOVE BOLT (2)

3. LOOSEN BOLT (3)

4. INSERT WASHERS (1) BETWEEN INTERMEDIATE PIPE FLANGE AND CONVERTER HANGER BRACKET AND INSTALL BOLT (2).

5. TORQUE BOLTS (2) AND (3) TO 47 N.M (35 LB.FT.).

6. LOWER VEHICLE

PART AVAILABILITY:

PARTS ARE CURRENTLY AVAILABLE FROM GMSPO.

WARRANTY INFORMATION:

FOR VEHICLES REPAIRED UNDER WARRANTY, USE:

LABOR OPERATION: T3375 LABOR TIME: 0.2 HR.

FIGURES: 1

Object Number: 83071 Size: FS

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.