SPARK KNOCK COMMENTS NEW PROM INFORMATION. Chevrolet Celebrity 1984

For 1990-2009 cars

# SPARK KNOCK COMMENTS NEW PROM INFORMATION

#### Model and Year 1984 CAMARO, CELEBRITY, AND CITATION WITH 2.5L ENGINE

This cancels and replaces 84-111 dated June, 1984 which should be destroyed. This copy identifies an additional axle ratio and a revised TCC engagement speed.

A customer comment of spark knock on the 2.5L engine may be received. If normal diagnosis in Section 6E2 of the Service Manual does not repair this condition, a new PROM may be installed, as listed below. This condition applies only to vehicles with automatic transmissions/transaxles.

Celebrity and Citation With 2:39 Axle P/N 1226909

Celebrity and Citation With 2:84 Axle (Also Increases TCC Engagement Speed to 38 MPH) P/N 1226909

Camaro With 3:73 Axle P/N 1226911

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.