Engine - Spark Knock or Detonation Noise
88pontiac03 Number 87-6(Gasoline)-85 Date 2/88Subject: SPARK KNOCK OR DETONATION NOISE
1987 OVERHEAD CAM L-4 TURBO ENGINE (VIN CODE M) IN SUNBIRD AND GRAND AM MODELS
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:
Pontiac Sunbird and Grand Am Auto. Trans. P/N 16120036
For other ignition related conditions, refer to Service Manual Section 6D4 or 6E.
Use applicable Labor Time and Operation Number.