ENG.STALL - INITIAL COLD START INTERMITTENT STALL ON DECEL.

VEHICLES AFFECTED: SOME 86 AND 87 N SERIES AND SOME 86 H SERIES EQUIPPED WITH 3.0L MFI ENGINES (VIN CODE L)

Some 1986 and 1987 N Series and some 1986 H Series equipped with a 3.OL MFI engine (VIN Code L) may experience one or more of the following conditions.

Poor cold driveability (tip-in sags, hesitations, rough idle).

Will not stay running on the initial start when the engine is cold (with proper fuel pressure and no leak down).

Engine intermittently will not stay running on decel or during parking lot maneuvers, under closed throttle conditions.

If any of these conditions are experienced on a vehicle when the basic engine, controls and systems are performing properly, and cannot be repaired by using currently published service and diagnostic procedures, it may be necessary to install a new service PROM.

Axle Sales Code Scanner Prom I.D. Model I.D. Located On If This PROM Service Application Axle Deck Lid Decal Is Installed Part No

1987 N Series 2.53 F16 1294 16081263 1987 N Series 2.84 F17 1304 16081268 1986 N Series All N/A 8590 1228590 1986 H Series All N/A 8589 16088725

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.