VEHICLE SURGE(REPLACE CONTROL VALVE BODY ASSEMBLY)

SUBJECT: VEHICLE SURGE (REPLACE CONTROL VALVE BODY ASSEMBLY)

MODELS: 1997 BUICK LESABRE 1997 OLDSMOBILE EIGHTY-EIGHT 1997 PONTIAC BONNEVILLE WITH 3.8L ENGINE (VIN K - RPO L36) AND HYDRA-MATIC 4T60-E TRANSAXLE/TRANSMISSION (RPO M13)

CONDITION: (SEE FIGURE 1) SOME OWNERS MAY COMMENT ON THE VEHICLE SURGING AT 72 TO 89 KM/H (45 TO 55 MPH) WITH TCC APPLIED UNDER A SLIGHT LOAD. TO VERIFY THE ABOVE CONDITION, PERFORM THE FOLLOWING TEST: DUPLICATE THE CONDITION AND NOTE THE TCC SLIP ON THE TECH II. THE SLIP WILL RANGE BETWEEN 50-150 RPM. NEXT, COMMAND THE TCC ON WITH THE TECH II. THE DUTY CYCLE SHOULD READ 99% AND THE VEHICLE SURGING CONDITION SHOULD NO LONGER BE EVIDENT. IF THE ABOVE TWO (2) PARAMETERS ARE MET, PROCEED WITH THE CORRECTION LISTED BELOW.

CAUSE:

A MAJORITY OF CAUSES FOR THE CONDITION MAY BE DUE TO AN OVERSIZE CONDITION IN THE TCC REGULATOR VALVE LINE-UP.

CORRECTION: (SEE FIGURE 2) TO REPAIR THIS CONDITION, REPLACE THE CONTROL VALVE BODY ASSEMBLY. THIS ASSEMBLY WILL INCLUDE A TCC REGULATOR VALVE LINE-UP THAT IS NOT OVERSIZED.

TO REPLACE THE CONTROL VALVE BODY ASSEMBLY, REFER TO SECTION 7 OF THE SERVICE MANUAL.

SERVICE PARTS INFORMATION:

TRANSMISSION PART NUMBERS MODEL DESCRIPTION ------------ ------------- ----------- 24212569 7ACW OR 7BXW CONTROL VALVE BODY ASSEMBLY 24212571 7ASW CONTROL VALVE BODY ASSEMBLY

PARTS ARE EXPECTED TO BE AVAILABLE OCTOBER 19, 1998.

WARRANTY INFORMATION:

FOR VEHICLES REPAIRED UNDER WARRANTY, USE:

LABOR CODE: K6570 LABOR TIME: 3.5 HOURS

FIGURES: 02 ATTACHMENTS: 00

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 1998 GENERAL MOTORS CORPORATION. ALL RIGHTS RESERVED.