PROM - Engine Spark Knock, Surge/High Cold Idle Speed
BULLETIN NUMBER: 93-6E-101SECTION: 6E Engine
NUMBER: 3
CORPORATE REFERENCE NUMBER: 336507
DATE: July 1993
SUBJECT:
ENGINE SPARK KNOCK, SURGE AND/OR HIGH COLD IDLE SPEED (NEW PROM)
MODELS:
1990-93 S TRUCKS W/2.8L (LL2) ENGINE AND MANUAL TRANSMISSION
CONDITION
Some owners of 1990-93 S-15 pickup trucks with a 2.8L eng: (RPO LL2) and manual transmission may comment that they encounter engine spark knock, surge, or high cold engine idle speed.
CAUSE
Engine system/component variability.
CORRECTION
If any of the subject conditions are found, then use the following procedure:
1. Perform diagnostic, per Section 6E of the Service Manual. Make any adjustments that are required, or replace any inoperative parts.
2. If no other conditions are found using normal diagnostics, and this condition or conditions still exist, then replace the prom.
SERVICE PARTS INFORMATION
Service Parts Information:
Parts are currently available from GMSPO.
WARRANTY INFORMATION
Warranty Information:
For vehicles repaired under warranty.