PING NOISE FROM EXHAUST RESONATOR. Buick Skylark 1994

SUBJECT: PING NOISE FROM EXHAUST RESONATOR (REPLACE INTERMEDIATE PIPE AND MUFFLER ASSEMBLY)

MODELS: 1994 BUICK SKYLARK 1994 CHEVROLET BERETTA AND CORSICA 1994 OLDSMOBILE ACHIEVA 1994 PONTIAC GRAND AM WITH 3.1L V6 ENGINE (VIN M - RPO L82) AND 4T60E AUTOMATIC TRANSMISSION

CONDITION:

SOME VEHICLES WITH A PRODUCTION INTERMEDIATE PIPE AND MUFFLER ASSEMBLY (PART NUMBERS LISTED BELOW) MAY EXHIBIT A PING NOISE DURING EXHAUST COOL DOWN.

CAUSE:

CONTRACTION OF LOUVER TUBE INSIDE OF RESONATOR.

CORRECTION:

IF THE INTERMEDIATE PIPE AND MUFFLER ASSEMBLY PART NUMBER (FOUND ON THE BOTTOM OF THE MUFFLER) IS THE SAME AS THE PRODUCTION ASSEMBLY PART NUMBER LISTED BELOW, THEN REPLACE WITH THE REVISED INTERMEDIATE PIPE AND MUFFLER PART NUMBER APPLICABLE.

IF THE PART NUMBER ON THE MUFFLER ASSEMBLY IS DIFFERENT THAN THE NUMBER LISTED IN THE CHART UNDER THE PRODUCTION INTERMEDIATE PIPE AND MUFFLER COLUMN, EXAMINE THE CONVERTER OR DOWN PIPE FOR THE CAUSE OF THE PING NOISE.

PRODUCTION EXHAUST PIPE + MUFFLER REVISED REVISED MAKE TYPE ASSEMBLY MUFFLER PIPE ==== ======= ============== ======= =======

CHEVROLET SINGLE 22592407 22592452 22592455 CHEVROLET DUAL TAILPIPE 22593486 22576743 22592455 PONTIAC SINGLE 22592406 22592451 22592455 PONTIAC DUAL MUFFLER 22592408 22592453 22592457 OLDSMOBILE SINGLE 22592407 22592452 22592455 OLDSMOBILE DUAL MUFFLER 22592409 22592454 22592457 BUICK SINGLE 22592407 22592452 22592455

PARTS ARE CURRENTLY AVAILABLE FROM GMSPO.

WARRANTY INFORMATION:

FOR VEHICLES REPAIRED UNDER WARRANTY, USE:

LABOR OPERATION NUMBER: L2720 USE PUBLISHED LABOR OPERATION TIME.

FIGURES: 0

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.