COLD START STALL, TIP-IN HES. ROUGH/MISS (NEW MEM CAL)

VEHICLES AFFECTED: 1988-89 N WITH 2.3L VIN D

Some 1988 and 1989 N models with 2.3L (VIN D) engine may exhibit one or more of the following conditions for the first 15 to 60 seconds after a cold start.

- Stall when put in gear - Tip-in hesitation after immediately put in gear - Reduced cold driveability (miss, rough running or backfire)

If any of the above conditions cannot be repaired, following proper service manual diagnosis, it may be necessary to install a new MEM-CAL.

New Mem-Cal Model Transaxle Scan I.D. Emissions Mem-Cal ----- --------- ---------- ---------- ------- 1988 Auto 6623 Federal 16136595 1988 Manual 6643 Federal 16136597

1989 models beginning with the VIN breakpoints shown below have the updated Mem-Cal. Models prior to the breakpoints may require the Mem-Cal shown:

1989 Auto 6033 Federal 16136029 Oldsmobile VIN KM244052

Buick VIN KMO21960

Pontiac VIN KC685595

1989 Manual 4003 Federal 16134216 Oldsmobile VIN KM250346

Pontiac VIN KC686845

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.