SPARK KNOCK OR DETONATION REVISED ESC CALIB. IN PROM P/N

SPARK KNOCK OR DETONATION

VEHICLES AFFECTED: 1987 J CAR WITH 2.0L TURBO ENGINE (VIN CODE M) ------------------

Owner comments of a warmed-up spark knock or detonation noise can be repaired with the following "more responsive ESC" PROM calibration:

Pontiac J Auto. Trans. P/N 16120036 Buick J Auto. Trans. P/N 16084410

For other ignition related conditions, refer to Service Manual Section 6D4 or 6E.

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.