PCM - Light Surge at Highway Speeds at Light Throttle

File In Section: 6E - Engine Fuel & Emission

Bulletin No.: 57-65-03A

Date: September, 1997

Subject:
Light Surge at Highway Speeds at Light Throttle (New Calibrations)

Models:
1994 Chevrolet and GMC Truck S/T Models
1994 Oldsmobile Bravada
with 4.3L V6 Engine (VIN W - RPO L35) and Automatic Transmission

This bulletin is being revised to change Emission Axle under S/T Utility. Please discard Corporate Bulletin Number 57-65-03 (Section 6E - Engine Fuel & Emission).

Condition

Some owners may comment on a light highway surge condition (minor engine RPM instability). This condition may occur at highway speeds with light throttle.

Cause

Calibration parameters not optimized for this operating condition.

Correction





If standard diagnostic procedures for the above conditions do not resolve the problem, the following calibrations (for this specific listed concern) may resolve the problem

Parts are currently available from GMSPO.

Warranty Information

For vehicles repaired under warranty, use:

Labor Operation Labor Time

J6364 Use published labor operation time.