IDLE SURGE AND/OR ENGINE DETONATION

SUBJECT: IDLE SURGE AND/OR ENGINE DETONATION

VEHICLES AFFECTED: 1992 "B" MODEL WITH 5.7L ENGINE (VIN 7, RPO LOS)

THIS BULLETIN SUPERSEDES AND REPLACES CORPORATE BULLETIN REFERENCE NUMBERS 136527- AND 136512**. THIS BULLETIN IS BEING REVISED TO ADD A CONDITION.

CONDITION:

--------- Some owners of 1992 Buick Roadmaster sedans/wagons, Chevrolet Caprice wagons and Oldsmobile Custom Cruiser wagons with the 5.7L (VIN 7, L05 V8) engine may comment on idle surge and/or engine detonation (spark knock).

CORRECTION:

---------- The calibration has been refined to address these comments. Replace the PROM with the following part number.

Broadcast Scanner Part Code I.D. Number Body Application --------- ------- ------ ---- ----------- BATJ 5901 16175898 B 5.7L L05 Nationwide Emissions Buick sedan and wagon, Chevrolet wagon Oldsmobile wagon

* BATN 5941 16176859 B 5.7L Leaded Fuel (RPO NM8)

* For Use By North American Export Sales Dealers Only.

WARRANTY INFORMATION:

For vehicles repaired under warranty use:

Labour Time: 0.5 hrs

** BULLETIN REFERENCES: ---------------------- Corporate Ref. 136527 Corporate Ref. 136512

General Motors of Canada 92-657-103 General Motors of Canada 91-657-112 Chevrolet Division 92-93-6E Buick Division 92-6E-1 Oldsmobile Division 92-T-68 Buick Division 92-6E-11

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.