Subject: | Engine Hesitates or May Stall During Initial Launch, DOHC (LLO) Engines (Install New PCM Calibration) |
Models: | All 1993 Saturns with DOHC (LLO) Federal and California engines with automatic transaxles built before, and including VIN PZ229154. |
Some customers of 1993 Saturns, equipped with DOHC (LLO) engines and automatic transaxles may comment that the engine hesitates or may stall on initial launches during cold temperature warm - up. The customer may also comment that the engine is hard to start after it stalls.
Due to engine sensitivity to cool ambient temperatures below 4° C (39°F), the engine may hesitate or stall during initial launches.
Verifying that the hesitation or install condition occurs during initial launches at ambient temperatures below 4°C (39°F) during cold start and warm - up.
Important: Before installing a new calibration, make a note of the transaxle calibration installed, and download the same transaxle calibration with the correct engine calibration.
1993 New ECM Calibration - DOHC (LLO) Engines | |
3534 | DOHC (LLO) Federal engines with automatic transaxle built before, not including VIN PZ229154 |
3536 | DOHC (LLO) California engines with automatic transaxle built before, and including VIN PZ229154 |
Important: After the new calibration has been installed, vehicle must be driven until operating temperature is reached. This allows the PCM to relearn variations in the fuel system electronic controls that improve driveability and engine idle.
Important: Verify that customer comment has been repaired. If problem still exists, refer to diagnostic procedures in the "Fuel/Air Intake/Exhaust Service Manual" and "Electronic Controls Service Manual."
To receive credit for this repair, submit a claim through the Saturn Dealer System as follows:
Case Type | Description | Labor Operation Code | Time |
VW | PCM EC/TC Calibration (Includes PDT Parameter and Code/Flag Checks) | T6636 | 0.3 hrs |