For 1990-2009 cars

# TPS-NOT ADJUSTABLE DO NOT ATTEMPT TO ADJUST

#### VEHICLES AFFECTED: 'A', 'F', 'J', 'N', 'P', And 'X' Series

Throttle Position Sensors are non-adjustable on 2.5L-TBI (Engine Codes 2,R,U), 1.8L-TBI (Engine Code O) and 1.8L-MFI (Engine Code J). No attempt (bending, etc.) should be made to adjust Throttle Position Sensors on subject engines. Throttle Position Sensors that do not meet specification should be replaced. The TPS on the 1982 2.5L engine is adjustable.

Labour Operation J6357 will no longer be valid for Engine Codes O, J, R, U, and 2.

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.