STALL, HES.AFTER COLD START DIAGNOSIS AND PROM P/N'S

MODEL AND YEAR: 1986-87 CAMARO WITH 2.8L (V.I.N. CODE S) P.F.I. ENGINE AND 4-SPEED AUTOMATIC TRANSMISSION

TO: ALL CHEVROLET DEALERS

Some 1986-87 Camaros with 2.8L P.F.I. engines and 4-speed automatic transmissions may experience one or more of the following conditions at 40 degrees (F) to 70 degrees (F) ambient temperatures:

Stall after cold start.

RPM sag or stall when shifting from neutral to drive immediately after cold start.

Cold driveaway hesitation.

To service this condition inspect for the following and repair as necessary.

1. Loose or leaking air duct between mass airflow (MAF) sensor and throttle body.

2. Low minimum idle speed. (specification is 550 plus or minus 50 RPM in drive, automatic transmission.)

3. Openings in the EGR transfer tube.

If the condition persists, check PROM I.D. with scan tool. If the PROM I.D. is not one of the following numbers, replace the PROM with one of the service PROMS listed in the following chart.

Scan tool reading of PROM I.D.: 8419, 8420, 9891, 9901, 9911, 9921

SERVICE PROM APPLICATION

AIR SERVICE MODEL EMISSIONS CONDITIONING PROM P/N ----- --------- ------------ --------- 1986 Camaro Federal Yes 16080006 No 1228419 California Yes 16080011

1987 Camaro Federal Yes/No 16080006 California Yes/No 16080011

NOTICE: The above PROMS are for Camaros with 2.8L port fuel injected engines with 4-speed automatic transmissions.

Use applicable labor time and labor operation numbers.

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.