IDLE SURGE/HESITATION DURING COLD START (NEW PROM RELEASED). GMC Truck S15 Pickup

THIS BULLETIN IS TO BE SENT OUT AS A DCS MESSAGE TO GMC TRUCK DEALERS ONLY.

SOME CUSTOMERS MAY COMMENT ABOUT AN IDLE SURGE OR HESITATION CONDITION DURING A "COLD " ENGINE START.

TO CORRECT THIS CONDITION A NEW PROM HAS BEEN RELEASED.

VEHICLES AFFECTED:

ALL 1991 SYCLONES BUILT AFTER VIN M8801522 WERE BUILT WITH THE NEW PROM.

SOME SYCLONES BUILT PRIOR TO THE ABOVE VIN BREAKPOINTS WILL ALSO HAVE THE NEW PROM. THESE TRUCKS WILL HAVE THE FOLLOWING INFORMATION HANDWRITTEN ON THE WHITE ECM BAR CODE LABEL.

PROM P/N 16163961 - BROADCAST AYBM UPDATED (DATE).

IF THE VEHICLE IS BUILT BEFORE THE ABOVE VIN BREAKPOINT AND DOES NOT HAVE THE UPDATE NOTE WRITTEN ON THE BAR CODE LABEL THE NEW PROM MAY CORRECT THE IDLE SURGE / HESITATION CONDITION.

SERVICE PARTS INFORMATION

PART NUMBER 16163961 - PROM

TO OBTAIN THE ABOVE PROM CONTACT THE GMC TRUCK TECHNICAL ASSISTANCE CENTER (800-624-2022) AND ONE WILL BE PROVIDED.

WARRANTY INFORMATION

FOR VEHICLES REPAIRED UNDER WARRANTY USE:

LABOR OPERATION: T0500 LABOR TIME: 0.8 HR.

NOTE: LABOR OPERATION IS CODED TO BASE VEHICLE COVERAGE IN THE WARRANTY SYSTEM.

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.