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Tbi lt1 vacuum diagram wiring diagram tbi vacuum diagram 1990 chevy silverado wiring diagram schemai have a 1987 chevy 1 2 ton 4x4 with a 5 7l tbi engine i am having dodge ram 1500 vacuum gm throttle body injection pg 1 this page is dedicated to the owners of these vehicles equipped with gms dual point fuel injection model 220 tbi although just a small number of cars 95 suburban wiring . Gm throttle body injection 1987 93 lo3 50l and lo5 57l engines this page is dedicated to the owners of these vehicles equipped with gms dual point fuel injection model 220 tbi. This video demonstrates how to test a tps on a 1994 chevy c1500 with a 350 tbi tools required are a multimeter and a small blade or a knife to slightly nick a wire to expose the wiring inside. Find great deals on ebay for 1990 chevy throttle body shop with confidence. The throttle position sensor on almost every engine has a 50 volt feed wire and a ground wire that will actually have 02 volts on it the tps has mechanical stops inside it that for the sake of explaining theory limits its range of travel on the signal wire from 05 volts to 45 volts it is physically impossible for the signal voltage to go outside that range unless there is a break in a