For 1990-2009 cars

# INOPERATIVE TPS INSTALL HEAT SHIELD

VEHICLES AFFECTED: 1982-86 "A" Car With 2.5L L4 (VIN Code R) Engine 1982-86 "F" Car With 2.5L L4 (VIN Code 2) Engine 1985-86 "N" Car With 2.5L L4 (VIN Code U) Engine 1984-86 "P" Car With 2.5L L4 (VIN Code R) Engine 1982-86 "J" Car With 1.8L L4 (VIN Code O) Engine 1985-86 "M" Van With 2.5L L4 (VIN Code E) Engine 1985-86 S/T Truck With 2.5L L4 (VIN Code E) Engine

Customer comments of reduced engine performance, poor, idle, and engine surge, may be received on 1982 thru 1986 "a-f-n-p-m" vehicles & "S/T" trucks equipped with 2.5L L4 engines and 1982 thru 1986 "J" vehicles equipped with 1.8L L4 (OHC) engines.

After a vehicle has been accurately diagnosed as having an intermittent electrical signal from the throttle position sensor, replace the sensor with AC TPS service kit, P/N 17078274. At the same time, remove the factory installed TPS heat shield attached by the EGR bolt and replace it with a new heat shield service kit, P/N 17111750 (Figure 1). The contents of the service kit are:

#### DESCRIPTION

Screw Assemblies - 2 Each (Hex Head) Heat Shield - Stainless Steel Graphics - Instruction Sheet

#### NOTICE: 1984-86 "P" CARS WITH 2.5L L4 ENGINES MUST USE AC TPS SERVICE KIT, P/N 17078274, WITH THE HEAT SHIELD SERVICE KIT, P/N 17111750. THE ATTACHING SCREWS PROVIDED WITH THE HEAT SHIELD SERVICE KIT (HEX HEAD) MUST BE USED WITH THE NEW TPS.

Whenever a new 300 Servies TBI is purchased from GM Parts and it is not complete with the AC TPS and the stainless steel heat shield it must be retro-fitted to include the new service parts.

Use applicable labor time and labor operation numbers.

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.