1992 Corvette: Service Bulletin: Engine Backfire During W.O.T. 1-2 Upshift

Subject: ENGINE BACKFIRE DURING W.O.T. 1-2 UPSHIFT (RPL. MEMCAL)
Model and Year: 1992 CORVETTE WITH 5.7L ENGINE (RPO LT1) AND AUTOMATIC TRANSMISSION
Source: Chevrolet Service Bulletin
Bulletin Number: 92-336-6E - (12/01/1992)

CONDITION:

Some owners of 1992 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 Code I.D. Number Style Axle

--------- ------- ------ ----- ----

BDBJ 4681 16184669 Coupe G44

BDBK 4691 16184672 Coupe/Conv GM1

BCBL 4701 16184678 Coupe/Conv GU2

BDBF 4661 16184667 Conv G44

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.