ENGINE BACKFIRE DURING W.O.T. 1-2 UPSHIFT (RPL. MEMCAL)

SUBJECT: ENGINE BACKFIRE DURING W.O.T. 1-2 UPSHIFT (REPLACE MEMCAL)

VEHICLES AFFECTED: 1992 "Y" MODEL WITH 5.7L ENGINE (VIN P, RPO LT1) AND AUTOMATIC TRANSMISSION

CONDITION:

--------- Some owners of 1992 Chevrolet Corvettes with the LT1 (VIN P 5.7L V8) engine and automatic transmission may comment on an engine backfire during a wide open throttle (W.O.T.) 1-2 upshift.

CORRECTION:

---------- The calibration has been refined to address this concern, replace the memcal with the appropriate one from the chart below.

Broadcast Scanner Part Body Axle Code I.D. Number Style ---- --------- ------- ------ ----- BDBJ 4681 16184669 Coupe G44 BDBK 4691 16184672 Coupe/Conv GM1 BCBL 4701 16184678 Coupe/Conv GU2 BDBF 4661 16184667 Conv G44

WARRANTY INFORMATION:

For vehicles repaired under warranty use:

Labour Time: 0.5 Hr.

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.