ENGINE SURGE IN 3RD GEAR NEW PROM PART NUMBERS

VEHICLES AFFECTED: 1985 AND 1986 'J' CARS WITH 2.8L (VIN CODE W) MPFI ENGINES AND 3 SPEED AUTOMATIC TRANSMISSION

Some 'J' cars may experience an engine surge condition in the 50 to 65 km/h (32 to 40 mph) range, in third gear, under steady throttle, with the torque converter clutch (TCC) applied.

To correct this condition, replace the PROM with one of the following PROMs:

MODEL AIR PROM APPLICATION YEAR SALES CONDITIONING P/N

'J' Car 1985 Federal YES 1228114 2.8L MPFI 1985 Federal NO 1228115 3 Speed Automatic 1985 California YES 1228115 1985 California NO 1228117

1986 Federal YES 1228118 1986 Federal NO 1228119

1986 California YES 1228120 1986 California NO 1228121

NOTICE: These PROMs contain a revised TCC engagement schedule that raises TCC engagement to 75 km/h (45 mph) and disengagement to 70 km/h (42 mph).

Use applicable labour time and operation number.

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.