SPARK KNOCK OR DETONATION REVISED ESC CALIB. IN PROM P/N. Buick Skyhawk 1987

For 1990-2009 cars

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

#### MODELS AFFECTED: 1987 SKYHAWKS WITH THE 2.OL OHC TURBO ENGINE (VIN CODE M) AND AUTOMATIC TRANSAXLE

Improvements made in the 1988 L-4 turbo electronic spark control (ESC) calibration are being made available to the 1987 L-4 turbo package.

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

Transaxle PROM Part Number --------- --------------- Automatic 16084410

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

#### WARRANTY INFORMATION

Use applicable Labor Time and Operation Number.

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.