S-10 TRUCK STALL-PERFORM DIAG. REPLACE INOP. PARTS/NEW MEMCAL. GMC Truck S15 Pickup - 2WD 1991

For 1990-2009 cars

# S-10 TRUCK STALL-PERFORM DIAG. REPLACE INOP. PARTS/NEW MEMCAL

#### SUBJECT: OCCASIONAL ENGINE STALL ON DECEL (PERFORM DIAGNOSTICS/MAKE ADJUSTMENTS, REPLACE INOPERATIVE PARTS - THEN REPLACE MEMCAL)

#### VEHICLES AFFECTED: 1991 S-10

#### Condition:

---------- Some owners of 1991 S-10 trucks with a 2.8L engine and manual transmission may comment that they encounter engine stall when pushing the clutch in during a deceleration.

#### Cause:

------ Low fuel volatility and/or system component variability.

#### Correction:

------------ If any of the subject conditions are found, then complete the following procedure:

1. Perform diagnostics, per Section 6E of the Service Manual. Make any adjustments that are required, or replace any inoperative parts.

2. If no other conditions are found using normal diagnostics, and this condition or conditions still exist, then replace the Memcal with one from the following table.

Part Number Description Code ----------- ------------------ ------- 16170408 MEMCAL (GU6/3.42 AND GT4/3.73 Axle) AZNU 16170409 MEMCAL (HO4/4.11 Axle) AZNW

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.