PROM - Hesitation, Sag/Chuggle On Accel During Warm-Up

Group Ref: Engine Fuel & Emission

Bulletin No. 316509

Date: February, 1994

SUBJECT:
HESITATION, SAG OR CHUGGLE ON ACCELERATION DURING WARM-UP (DIAGNOSE INSTALL NEW EPROM)

MODELS:
1990-91 CHEVROLET BERETTA
(WITH 2.3L ENGINE - VIN A - RPO LG0)

1990-91 OLDSMOBILE CUTLASS SUPREME
1990-91 PONTIAC GRAND PRIX (WITH 2.3L ENGINE - VIN D - RPO LD2)

1990-92 BUICK SKYLARK
1990-92 OLDSMOBILE ACHIEVA
1990-92 PONTIAC GRAND AM
(WITH 2.3L ENGINE - VINs A, D, 3 - RPOs LGO, LD2, L40)

Some owners may experience a driveability concern such as hesitation or sag during the first two minutes of cold operation while vehicle is under moderate to heavy throttle driveaway, or they may experience a Torque Converter Clutch (TCC) chuggle.

If the above conditions exist after following proper service manual diagnosis, it may be necessary to install a new MEM-CAL/EPROM to correct the driveability concern.








Parts are currently available from GMSPO.

Comments:

1. The Mem-Cal/EPROM is to repair hesitation or sag when the ambient temperature is around 0 - 15° C during the first two minutes of engine operation.

2. The Mem-Cal/EPROM is to repair Torque Converter Clutch (TCC) Chuggle.

If the above condition cannot be repaired through the above diagnosis, refer to Corporate Bulletin 076001 (Oldsmobile 90-T-157 and Pontiac 90-6-45) for 2.3L Engine Intake Valve Deposits.

WARRANTY INFORMATION:

For vehicles repaired under warranty, use: Labor Operation: J6364

Labor Time: Use published labor operation time.