Some customers of 1992 Saturns, equipped with SOHC (LKO) engines may comment that the engine stalls after the vehicle is initially started, or stalls when first shifted into gear or during engine warm-up. Customers may also comment of increased-idle conditions after a stall on initial start while vehicle is out of gear.
Due to engine sensitivity to variations in cool ambient temperatures along with the new 1992 Federal regulations that address Spring and Summer fuel grade volatility, initial start-up and warm-up driveability has been impacted, especially on new engines.
CORRECTIVE ACTION: Verify that the start/stall condition occurs during initial start or engine warm-up, then proceed with the Steps listed under "Procedures," on the next page.
On vehicles built after January 1, 1992, proceed to Steps 1 through 3 of this bulletin. If the condition still exists after following the procedures in this bulletin and the new calibration has been installed, refer to Technical Information Bulletin 91-T-35A and completely follow the bulletin instructions.
1. Using the Scan tool, check for PCM EC/TC codes and flags. If codes or flags are present, refer to the applicable diagnostic charts in the "Electronic Engine Controls Service Manual" and repair the condition. After verifying that condition has been repaired, download the new calibration according to Step 3.
2. If no codes or flags are present, monitor Scan tool data and verify all parameters are within specification. Refer to "Electronic Engine Controls Service Manual." If parameters are not within specification, repair the condition. After verifying that condition has been repaired, download the new calibration according to Step 3.
3. If no codes or flags are present and Scan tool data is within specification, download new calibration using the Saturn Service Stall System or refer to the "Electronic Engine Controls Service Manual."
TCM ECM
0749 3184 Automatic Transaxles before VIN NZ205625, excluding NZ200001 through NZ200100
8518 3184 All Other Automatic Transaxles 3182 Manual Transaxles
CLAIM INFORMATION: To receive credit for this repair, submit a claim through the Saturn Dealer System as follows: Labor Case Operation Type Description Code Time ---- ----------- --------- ---- VW PCM EC/TC Calibration T9621 0.3 hrs (Includes PDT Parameter and Code/Flag Checks)
General Motors bulletins are intended for use by professional technicians, not a "do-it-yourselfer". They are written to inform those technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions and know-how to do a job properly and safely. If a condition is described, do not assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See a General Motors dealer servicing your brand of General Motors vehicle for information on whether your vehicle may benefit from the information.