Hesitation Or Lack Of Power On Acceleration (Reprogram PCM)
| Subject: | Intermittent Hesitation or Lack of Power On Acceleration (Reprogram PCM) |
| Models: | 1999 Oldsmobile Alero |
| 1999 Pontiac Grand Am |
| with 3.4 L Engine (VIN E -- RPO LA1) |
Condition
Some owners may comment about an intermittent hesitation or lack of power on acceleration. The malfunction indicator lamp (MIL) will not be illuminated, and no codes will be stored. If ESC spark advance is monitored with a TECH II scan tool during the condition, a reduction in ESC spark advance (typically 14-19 degrees) will be observed.
Cause
Condition may be caused by the knock sensor interpreting normal engine harmonics as combustion detonation.
Correction
A revised calibration has been released to correct this concern. Reprogram the PCM using the correct calibration listed below.
Parts Information
Part Number | Description |
|---|---|
9386584 | FEDERAL - OLDSMOBILE LA1&MN5&F83&NF2-K29 |
9386594 | CALIFORNIA - OLDSMOBILE LA1&MN5&F83&NF2&NB7 |
9386644 | UNLEADED EXPORT - OLDSMOBILE LA1&MN5&F83&NF2&NA7 |
9386634 | UNLEADED EXPORT - PONTIAC LA1&MN5&F83&NF2&K29 |
9386604 | CALIFORNIA - PONTIAC LA1&MN5&FR9&NB7&RA1 |
9386624 | UNLEADED EXPORT - PONTIAC LA1&MN5&FR9&K29&NF2&RA1 |
9386614 | FEDERAL - PONTIAC LA1&MN5&FR9&NF2&RA1-K29 |
The calibrations listed are electronic calibrations and are NOT available from GMSPO. Calibrations will be available from Techline starting August 1999, on the TIS 2000 Disc 16 CD ROM or Techline Disc 16/17 CD ROM.
Warranty Information
For vehicles repaired under warranty, use:
Labor Operation | Description | Labor Time |
|---|---|---|
J6355 | ON CAR REPROGRAMMING | Use Published Labor Time |
