COLD ENGINE PERFORMANCE SAG/NEW PROM

VEHICLES AFFECTED: 1985 Corvette with Automatic Transmission

Customer comment of poor performance or sag during rapid one-quarter (1/4) throttle acceleration during the first mile of engine warm up when outside temperatures are below 35 degrees F may be received on some 1985 Corvettes with L98 5.7L engines and automatic transmission.

A new service PROM is available to repair this condition. Refer to the chart below for correct usage of the service PROM:

Model Service PROM ----- ------------

Automatic Transmission 16052290

All Corvettes produced after March 8, 1985 (VIN 1G1440786F5120252) have a new ECM and PROM installed.

The procedures to be followed for this repair are detailed in Section 6E3-76 of the 1985 Corvette Shop Manual.

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.