CAMPAIGN: THROTTLE BODY DRIVE UNIT

GROUP: 6A-ENGINE MECHANICAL DATE: JANUARY 1993

SUBJECT: THROTTLE BODY DRIVE UNIT MODELS: 1989-91 B6 SCHOOL BUS CHASSIS EQUIPPED WITH 6.0L GAS ENGINES (LSO) 1993 B7 SCHOOL BUS CHASSIS EQUIPPED WITH 6.0L GAS ENGINES (LSO)

THE NATIONAL TRAFFIC AND MOTOR VEHICLE SAFETY ACT, AS AMENDED, PROVIDES THAT EACH VEHICLE WHICH IS SUBJECT TO A RECALL CAMPAIGN OF THIS TYPE MUST BE ADEQUATELY REPAIRED WITHIN A REASONABLE TIME AFTER THE OWNER HAS TENDERED IT FOR REPAIR. A FAILURE TO ADEQUATELY REPAIR WITHIN 60 DAYS AFTER TENDER OF A VEHICLE IS PRIMA FACIE EVIDENCE OF FAILURE TO REPAIR WITHIN A REASONABLE TIME.

IF THE CONDITION IS NOT ADEQUATELY REPAIRED WITHIN A REASONABLE TIME, THE OWNER MAY BE ENTITLED TO AN IDENTICAL OR REASONABLY EQUIVALENT VEHICLE AT NO CHARGE, OR TO A REFUND OF THE PURCHASE PRICE LESS A REASONABLE ALLOWANCE FOR DEPRECIATION.

TO AVOID HAVING TO PROVIDE THESE BURDENSOME SOLUTIONS, EVERY EFFORT MUST BE MADE TO PROMPTLY SCHEDULE APPOINTMENTS WITH OWNERS AND TO REPAIR THEIR VEHICLES AS SOON AS POSSIBLE. AS YOU WILL SEE IN READING THE ATTACHED COPY OF THE LETTER WHICH IS BEING SENT TO OWNERS, THE OWNER IS BEING INSTRUCTED TO CONTACT THE NEAREST GMC ZONE OFFICE IF THE DEALER DOES NOT REMEDY THE CONDITION WITHIN FIVE DAYS OF THE MUTUALLY AGREED UPON SERVICE DATE. IF THE CONDITION IS NOT REMEDIED WITHIN A REASONABLE TIME, THEY ARE INSTRUCTED HOW TO CONTACT THE NATIONAL HIGHWAY TRAFFIC SAFETY ADMINISTRATION.

GENERAL MOTORS HAS DETERMINED THAT A DEFECT, WHICH RELATES TO MOTOR VEHICLE SAFETY, EXISTS IN CERTAIN 1989-91 B6 SCHOOL BUS CHASSIS EQUIPPED WITH 6.0L ENGINES (LSO) AND 1993 B7 SCHOOL BUS CHASSIS EQUIPPED WITH 6.0L ENGINES (LSO). A MANUFACTURING CONDITION IN THE TBI UNIT MAY HAVE OCCURRED THAT COULD ALLOW THE THROTTLE CAM LEVER TO DISENGAGE FROM THE THROTTLE DRIVE SHAFT. WHEN THIS OCCURS, THE ENGINE COULD GO TO WIDE OPEN THROTTLE. IF RPM REACHES 4,000, THE GOVERNOR IS ACTUATED, PREVENTING THE ENGINE FROM EXCEEDING 4,000 RPM. ALTHOUGH THE VEHICLE CAN STILL BE STOPPED WITH THE SERVICE BRAKE, LOSS OF ACCELERATOR CONTROL COULD RESULT IN A VEHICLE CRASH WITHOUT PRIOR WARNING. TO ASSURE THIS CONDITION DOES NOT EXIST, THE DEALER WILL INSPECT FOR PROPER THROTTLE CAM LEVER TO SHAFT ATTACHMENT AND, IF NECESSARY, REPLACE THE THROTTLE DRIVE COVER ASSEMBLY. IT IS ANTICIPATED THAT EXTREMELY FEW DRIVE COVER ASSEMBLIES WILL NEED TO BE REPLACED, IF ANY. REPLACEMENT PARTS CAN BE OBTAINED FROM AC-ROCHESTER (716- 647-7240) ON AN EXCHANGE BASIS. ANY SUSPECTED DEFECTIVE PART MUST BE RETURNED TO AC-ROCHESTER.

VEHICLES INVOLVED

INVOLVED ARE CERTAIN 1989-91 B6 SCHOOL BUS CHASSIS EQUIPPED WITH 6.0L ENGINES (LSO) AND 1993 B7 SCHOOL BUS CHASSIS EQUIPPED WITH 6.0L ENGINES (LSO).

MODEL YEAR MODEL FROM THROUGH

1989 B6 SOP EOP 1990 B6 SOP EOP 1991 B6 SOP EOP 1993 B7 SOP 9/24/92 BUILD DATE

THE SPECIFIC VEHICLES INVOLVED IN THIS CAMPAIGN HAVE BEEN IDENTIFIED BY VEHICLE IDENTIFICATION NUMBER COMPUTER LISTINGS. THESE LISTINGS ARE FURNISHED TO ALL INVOLVED DEALERS WITH THE CAMPAIGN BULLETIN. DEALERS SHOULD CONFIRM VEHICLE ELIGIBILITY THROUGH VISS (VEHICLE INFORMATION SERVICE SYSTEM) PRIOR TO BEGINNING CAMPAIGN REPAIRS.

PARTS ARE TO BE OBTAINED FROM GENERAL MOTORS AC-ROCHESTER (716-647-7240). DO NOT ORDER THROTTLE DRIVE COVER FROM GENERAL MOTORS SERVICE PARTS OPERATION (GMSPO).

PART NUMBER DESCRIPTION QUANTITY

NPN THROTTLE DRIVE COVER 1 ASSEMBLY

12345382 THREAD LOCKING COMPOUND AS REQUIRED

WARRANTY INFORMATION

DEALERS SHOULD SUBMIT AN ACCURATELY FILLED OUT WARRANTY REPAIR ORDER ON EACH VEHICLE COMPLETED UNDER THIS CAMPAIGN.

LABOR OPERATION *TIME **PARTS TROUBLE NUMBER DESCRIPTION ALLOWANCE ALLOWANCE CODE

V7820 INSPECT AND/ .4 HRS. $16.38 96 OR REPLACE THROTTLE DRIVE COVER ASSEMBLY

* FOR DEALER TO RECEIVE ADMINISTRATIVE TIME ALLOWANCE ASSOCIATED WITH THIS CAMPAIGN, ADD 0.1 HOUR TO THE LABOR OPERATION TIME ALLOWANCE. **THE "PARTS ALLOWANCE" SHOWN IS 30% OF THE DEALER NET PRICE OF THE THROTTLE DRIVE COVER ASSEMBLY SUPPLIED (IF REPLACEMENT IS NECESSARY) BY AC-ROCHESTER, FREE OF CHARGE. IN THE EVENT OF THROTTLE DRIVE COVER REPLACEMENT, ONLY THE 30% MARK-UP SHOULD BE SUBMITTED. ALL OTHER PARTS REQUIRED FOR THE REPAIR SHOULD BE SUBMITTED IN THE NORMAL MANNER OF THE CURRENT GMSPO DEALER NET PRICE PLUS 30%.

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.