HESITATION/STALL AFTER COLD START-NEW PROM MAY REPAIR. Pontiac 6000 1986

SOME OWNERS OF 1986 A-CARS WITH 2.8L MULTI PORT FUEL INJECTION (MPFI) ENGINE AND A 3-SPEED AUTOMATIC TRANSMISSION MAY EXPERIENCE A STALL AFTER COLD START OR AN ENGINE HESITATION DURING A COLD DRIVEAWAY.

TO SERVICE THIS CONDITION, WHICH GENERALLY OCCURS AT APPROXIMATE TEMPERATURES OF 50 - 70 DEGREES FAHRENHEIT COMPLETE THE DIAGNOSTIC PROCEDURES PER SECTION 6 OF THE SERVICE MANUAL. SPECIFIC ATTENTION SHOULD BE GIVEN TO THE FOLLOWING ITEMS AND REPAIR AS REQUIRED:

1. LOOSE OR LEAKING AIR DUCT BETWEEN MASS AIRFLOW (MAF) SENSOR AND THROTTLE BODY.

2. LOW BASE IDLE AIR RATE.

3. OPENINGS IN THE EGR TRANSFER TUBE.

IF THE CONDITION PERSISTS, REPLACE THE PROM WITH ONE OF THE FOLLOWING SERVICE PROMS, WHICH MAY BE OBTAINED FROM GMSPO. (SEE THE FOLLOWING CHART).

IMPORTANT: THE NEW SERVICE PROMS ARE FOR A-CARS WITH A 2.8L PORT FUEL INJECTED ENGINE AND A 3-SPEED AUTOMATIC TRANSMISSION.

A-CARS W/ 2.8L PORT FUEL INJECTED ENGINE AND 3-SPEED TRANSMISSION __________________________________________________________________

EMISSION TRANS. SCANNER SERVICE PROM SYSTEM MODEL AXLE A/C I.D. PART NUMBER REMARKS ---------- -------- ------ ----- -------- ------------- -------

CALIFORNIA 1-2AA19,27 F17 YES 7431 16137337 3-4AA19,27

CALIFORNIA 1-2AA19,27 F17 NO 7441 16137338 3-4AA19,27

FEDERAL 1-2AA19,27 F75 YES 7451 16137339 3-4AA19,27

FEDERAL 1-2AA19,27 F75 NO 7461 16137342 3-4AA19,27

CALIFORNIA 1-2AA19,27 F75 YES 7471 16137343 3-4AA19,27

CALIFORNIA 1-2AA19,27 F75 NO 7581 16137367 3-4AA19,27

FEDERAL 1-2AA35 F17 YES 7481 16137344 3-4AA35

FEDERAL 1-2AA35 F17 NO 7491 16137345 3-4AA35

CALIFORNIA 1-2AA35 F17 YES 7501 16137346 3-4AA35

CALIFORNIA 1-2AA35 F17 NO 7511 16137347 3-4AA35

FEDERAL 1-2AA35 F75 YES 7521 16137348 3-4AA35

2AA19 PONTIAC WAGONS AND STE

FEDERAL 1-2AA35 F75 NO 7531 16137349 3-4AA35

CALIFORNIA 1-2AA35 F75 YES 7541 16137350 3-4AA35

2AA19 PONTIAC WAGONS AND STE

CALIFORNIA 1-2AA35 F75 NO 7551 16137352 3-4AA35

FEDERAL 1AAOO 9C1 YES 7561 16137353 POLICE PACKAGE

FEDERAL 1AAOO 9C1 NO 7571 16137354 POLICE PACKAGE

FEDERAL 1-2AA19,27 F17 YES 7811 16137795 3-4AA19,27

FEDERAL 1-2AA19,27 F17 NO 7661 16137415 3-4AA19,27

PARTS ARE EXPECTED TO BE AVAILABLE ON MARCH 13, 1989. UNTIL THEN NORMAL PART ORDERS WILL NOT BE ACCEPTED BY GMSPO. ONLY VERIFIABLE EMERGENCY VIP ORDERS WILL BE ACCEPTED. SPO WILL MAKE EVERY EFFORT TO OBTAIN PARTS. ALL PARTS WILL BE PLACED ON 400 CONTROL TO WAIVE VIP SURCHARGES. HOWEVER, THE PART WILL BE SHIPPED PREMIUM TRANSPORTATION AT DEALER'S EXPENSE. ALL OTHER ORDER TYPES WILL BE CANCELED AS INCORRECTLY ORDERED WHILE THE 400 CONTROL IS IN PLACE.

LABOR OPERATION NUMBER: T1417

LABOR TIME : .5 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.