ROUGH IDLE SURGE OR HESITATION FEEDBACK SOLENOID MAY REPAIR

Model and Year: 1985-88 "R" CAR

TO: ALL CHEVROLET DEALERS:

This bulletin cancels and supercedes Dealer Service Bulletin 88-368-6E dated November, 1988. All copies of 88-368-6E should be discarded.

This bulletin provides a new labor operation and time allowance to use when performing repairs on vehicles covered by warranty.

Some of the subject vehicles may experience various engine driveability conditions such as rough /erratic idle, hesitation or surge. When the condition has developed over a period of miles, usually reported after 10,000 miles/16000 kms have been accrued on the vehicle, a probable cause is intrusion of dirt, engine carbon, or oil mist into the area of the mixture control (M/C) solenoid (also known as the duty on feedback solenoid).

A revised M/C solenoid has been introduced in production and also as a service part for affected vehicles. This new part incorporates various changes to counteract the effects of foreign materials on operational effectiveness of the solenoid.

Vehicles beginning with VIN serial number J7559769 incorporate the new part.

Vehicles exhibiting the described symptoms should have the M/C solenoid removed and replaced with the new part, P/N 94332796.

Parts are currently available from GMsPO.

Procedures for the removal and installation of the M/C solenoid can be found in the Service Manual, carburetor service section.

Labor Operation Number: J6362

Labor Time : 1.0 Hours

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.