Engine - Hesitation/Stumble on Acceleration

File In Section: 06 - Engine/Propulsion System

Bulletin No.: 01-06-04-058

Date: January, 2002

TECHNICAL

Subject:
Hesitation, Stumble on Acceleration (Recalibrate PCM)

Models:
2000 Chevrolet Impala
with 3.8L V-6 Engine (VIN K - RPO L36) and NC8 (California Emissions)

Condition

Some owners may comment on an intermittent hesitation on acceleration during engine warm-up. No PCM diagnostic trouble codes will be stored, and no MIL will illuminate.

Cause

In some instances, the PCM fueling strategy may not be optimized during certain ambient temperatures.

Correction

1. Verify no PCM codes are stored. If PCM codes are stored, proceed with published diagnostic information found in the Service Information Manual. Once the conditions for the code have been corrected, proceed to step 2.

2. Recalibrate the PCM with the latest calibration. Calibrations are available from Techlme starting September 2001, version 10.0.

Calibration Information

The Calibrations are electronic calibrations and are NOT available from GMSPO. Calibrations are available from Techline starting September 2001, on the TIS 2000 version TIS 10.0/2001 data update or later.

Warranty Information





For vehicles repaired under warranty, use the table.





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