For 1990-2009 cars

# SPARK KNOCK COMMENTS NEW PROM INFORMATION

#### Models Affected: 1984 Skylarks with 2.5L Engine

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 also increases TCC engagement speed to 38 mph. This condition applies only to vehicles with automatic transmissions/transaxles.

Prom - Part Number 1226909

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.