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Engine - Spark Knock or Detonation Noise

88pontiac03 Number 87-6(Gasoline)-85 Date 2/88


Subject: 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.