Hesitation, Sag, Stumble and/or Backfire on Acceleration (Reprogram PCM)
| Subject: | Hesitation, Sag, Stumble and/or Backfire on Acceleration (Reprogram PCM) |
| Models: | 1999 Chevrolet Corvette |
| with 5.7 L Engine (VIN G -- RPO LS1) |
Condition
Some customers may comment on a hesitation, sag, stumble and/or backfire on acceleration during cool summer days/evenings with ambient temperature below 10°C (50°F).
Cause
Condition may be due to lean calibration with Low Reed Vapor Pressure Fuels (summer grade premium fuel) at lower ambient temperatures, below 10°C (50°F).
Correction
Reprogram the PCM with a new service calibration.
Parts Information
Previous Calibration P/N | New Calibration P/N |
|---|---|
16263856 | 16263683 |
16263857 | 16263701 |
16263858 | 16263709 |
16263859 | 16263710 |
The calibrations listed are electronic calibrations and are NOT available from GMSPO. Calibrations will be available from Techline on the 1999 Disc 10 CD ROM or the TIS 2000 Disc 12 CD ROM.
Warranty Information
For vehicles repaired under warranty, use:
Labor Operation | Labor Description | Labor Time |
|---|---|---|
J6355 | Prom -- Reprogramming On Car | Use published labor operation time |
