Camaro V6-3.8L VIN K (1995)
PROM - Programmable Read Only Memory: Customer Interest
Ignition - Engine Spark Knock at Idle
File In Section: 6E - Engine Fuel & Emission
Bulletin No.: 77-65-22
Date: October, 1997
Subject:
Engine Spark Knock at Idle
(Flash with New Calibration)
Models:
1995-96 Chevrolet Camaro
1995-96 Pontiac Firebird
with 3800 Series II Engine (VIN K - RPO L36) and Automatic Transmission
Condition
Some owners may comment about a spark knock noise when the engine is idling with the transmission selector placed in drive and brakes applied. The
condition may be most noticeable when ambient temperature is above 96°F (35°C).
Cause
Current Powertrain Control Module (PCM) calibration may adjust the engine spark advance too high during these temperatures and load conditions.
Correction
Reflash the PCM with the new calibration. The new calibrations are available beginning with 1997 CD Disc 18 from GM Service Technology Group.
Important:
Do not attempt to order the calibrations from GMSPO. The calibrations are programmed into the vehicle's PCM via a Tech line Tool Device.
Parts Information
Warranty Information
For vehicles repaired under warranty, use the table.
