INJECTOR USAGE - FLOW RATE SIDE TO SIDE DIFFERENCE

MODELS: 1987 R, V, M, AND G MODELS EQUIPPED WITH THE 4.3L TBI ENGINE

The Throttle Body Injection (TBI) assembly installed on the 1987 4.3L light duty truck engine uses injectors with DIFFERENT flow rates in each throttle bore for improved emission control. The TBI units involved are model numbers 17087090 and 17087162. If the injectors are removed for any reason, care must be taken to make sure they are installed in their proper location. See Figure No. 1 for model number and injector location.

INJECTOR LOCATION INFORMATION

Throttle Lever Side Bore COLOR-CODED ORANGE AND GREEN

o New service package Part Number 17111928

o Remanufactured equivalent Part Number 17111930

TPS Side Bore COLOR-CODED PINK AND BROWN

o New service package Part Number 17111929

o Remanufactured equivalent Part Number 17111931

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.