Engine - Cold Acceleration Hesitation or Stall

91chevy07

Number: 91-222-6E


Section: 6E


Date: March 1991


Corporate Bulletin No.: 136502


Subject:


HESITATION OR STALL ON COLD ACCELERATION


Model and Year: 1990-91 CAVALIER, CORSICA, BERETTA WITH 2.2L ENGINE AND 3T40 AUTOMATIC TRANSMISSION


Condition: Some owners of 1990 and 1991 J and L cars with 2.2L engines may comment of an engine hesitation or stall during a cold acceleration.


Cause: Low volatility fuel that does not fully vaporize in a cold intake manifold.


Correction: New PROM packages have been released which compensate for low volatility fuel during cold acceleration. Install the correct PROM package based on the chart below, and recommend that the owner use low octane fuel (87 or equivalent).

Vehicles Affected:

Body Model Emissions Assembly Vehicles
Style Year Type Plant Affected

J 1990 Federal Janesville All
Lordstown All
Calif. Janesville All
Lordstown All

1991 Federal Janesville All
Lordstown VIN Prior to M7173516
Calif. Janesville ALL
Lordstown VIN Prior to M7173032

L 1990 Federal Linden All
Wilmington All
Calif. Linden All
Wilmington All

1991 Federal Linden VIN Prior to ME1 42136
Wilmington VIN Prior to MY159347
Calif. Linden VIN Prior to ME142841
Wilmington VIN Prior to MY159089


PROM Applications:


Body Emissions Broadcast Scanner PROM Part
Style Type Code I.D. Number

J Federal AWWM 8321 16158344

Calif. AWWN 8331 16158349

L Federal AWWP 8341 16158354

Calif. AWWR 8351 16158358

Parts are currehtly available from GMSPO.

Labor Operation Number: T0500

Labor Hours: 0.4 Hours

Trouble Code: 92