COLD START STALL (INSTALL NEW PROM)

Subject: COLD START STALL

Model and Year: 1992 C/K TRUCKS AND G-VAN WITH 5.OL ENGINE

CONDITION:

Some owners of 1992 model year C/K trucks and G vans with 5.0 liter V8 engines (VIN H) may oomment of engine cold start stall. The potential stall generally occurs when the throttle is slightly opened.

CAUSE:

Inital cold start stalling was due to lean fueling during cold start operation.

CORRECTION:

If normal diagnostics and service procedures do not correct the above condition, a revised calibration PROM should be installed (see below).

New Broad- New PROM Scanner Transmission Emissions cast Code Part No. ID

MD8 (auto) NA5/NA6 BFUS 16193107 3115 MD8 (auto) NB2 (Calif) BFUU 16193109 3135 MG5 (manual) NA5/NA6 BFUT 16193108 3125

Parts are expected to be available April 19,1993.

Use Labor Operation: T0500

Labor Times: C/K: 0.6 hour G: 0.5 hour

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.