Engine - Detonation Under Light Throttle

88chevy05

Number: 86-259-6E

Section: 6E
Date: MARCH, 1988
Subject: DETONATION UNDER LIGHT THROTTLE


Model and Year: 1985-86 CAVALIER WITH L-4 (VIN CODE P)

ENGINE AND AUTOMATIC TRANSMISSION
TO: ALL CHEVROLET DEALERS


Customer comments of detonation under light-to-medium throttle operation may be resolved with one of the following service PROMs. This calibration will service both 1985 and 1986 automatic vehicles.

Service PROM

Federal Emission Package P/N 16122999
California Emission Package P/N 16123000

The service manual (Section 6E on "Detonation/Spark Knock") should be referred to for other causes of detonation.

Use applicable labor operation and time.