OCCASIONAL ENGINE STALL DIAGNOSTIC/NEW SERVICE MEMCAL

VEHICLES AFFECTED: 1988 A AWD W/3.1, 1988 J W/2.8, 1989 A/J/L/W W/2.8L

Some customers driving the following cars;

- 1988 J-car with a 2.8L engine (VIN Code W) - 1989 A/J/L/W models with a 2.8L engine (VIN Code W)

May comment concerning any of the following:

A cold start stall, A tip-in hesitation, or A decel stall

If a customer comment concerning an occasional engine stall or a drive hesitation is received, then complete the following:

1. Perform diagnostic checks, per Section 6 of the Service Manual and replace any defective components. Proceed to Step #2 only if diagnostic checks uncover no cause for the customer comments.

2. Install a new MEMCAL, which may be obtained from CANSPO (reference the attached service part number chart).

IMPORTANT: The following procedure must be completed when removing and installing a 60 degree V6 engine Electronic Control Module (ECM) MEMCAL (Reference Product Service Bulletin 89-628-102, dated 12-15-88.

a). Disconnect the battery.

b). Remove current MEMCAL and install a new service MEMCAL.

c). Restore the battery power and place air conditioning controls (if equipped) in the "off" position.

d). Firmly apply the parking brake and block the drive wheels. Start the engine, and shift the transaxle to "drive" for automatics or "neutral" for manuals.

e). Allow the engine to run until the engine cooling fan has cycled once, or a maximum of 10 minutes.

f). Turn the ignition key to the "off" position for at least 5 seconds.

g). Start the engine, and shift the transaxle to "drive" for automatics or "neutral" for manuals.

h). Allow engine to run for at least 5 minutes.

MEMCAL CHART

TRANSAXLE SCANNER SERVICE YEAR MODEL TRANS. RATIO I.D. MEMCAL P/N ---- ----- ------- ----- ---- ---------- 1988 JB 5SP M/T MG2 FX8 4751 16134466 3SP A/T MD9 F75 4761 16134468 F17

1989 AB 4 SP A/T ME9 GX3 8041 16138184 3 SP A/T MD9 F17 8021 16138174 1989 WB 5 SP M/T MG2 4671 16134552 4 SP A/T ME9 8151 16138169 1989 JB 5 SP M/T MG2 FX8 4611 16134615 3 SP A/T MD9 8121 16138219 1989 LB 5 SP M/T MG2 FX8 4651 16134640 3 SP A/T MD9 F75 8101 16138210

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.