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Engine Controls - Driveability Issues Using CNG Fuel

Bulletin No.: 04-06-04-082

Date: November 09, 2004

TECHNICAL

Subject:
Driveability Concerns After Deceleration with CNG Fuel, DTC P0171 (Reprogram PCM)

Models:
2004 Chevrolet Cavalier

with 2.2L 4 Cylinder Engine (VIN 6 - RPO L42)
and Bi-Fuel Option (RPO KL6)

Condition

Some customers may comment on various driveability concerns, while operating in CNG (Compressed Natural Gas) mode, following a deceleration maneuver from 40 to 50 mph (64 to 80 km/h). This may result in the Service Engine Soon light coming on and a DTC P0171 (Fuel Trim System Lean) being set. In some very rare instances, the engine may stall at speeds less than 10 mph (16 km/h) after a long closed throttle deceleration.

Correction

Reprogram the PCM with the listed calibration or later.

Part Number 12596936

The new calibration will be released beginning with TIS satellite data update version 9.0 for 2004, available September 4, 2004. As always, make sure your TECH2(R) is updated with the latest software version.

Warranty Information





For vehicles repaired under warranty, use the table.





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