TPS-NOT ADJUSTABLE DO NOT ATTEMPT TO ADJUST

Models Affected: All 1982-85 Models Equipped with 1.8L Engine (Vin Codes O & J) and all 1983-85 Models Equipped with 2.5L Engine (Vin Codes R & U)

Throttle Position Sensors are non-adjustable on 2.5L Engines (VIN Codes R & U) and 1.8L Engines (VIN Codes O & J). No attempt should be made to adjust Throttle Position Sensors on subject engines. Throttle Position Sensors that do not meet specifications should be replaced. The TPS on the 1982 2.5L engine is adjustable.

With the release of this bulletin, Labor Operation J6357 will no longer be valid for Engine Codes 0, J, R and U with the exception of the 1982 2.5L engine.

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.