Sentra Wagon FWD L4-1597cc 1.6L SOHC (GA16i) (1989)
Electro Injection Unit (TBI Type Fuel Inj): Description and Operation
Throttle Body
The throttle body is mounted on the intake manifold. It contains the fuel injector, air flow meter, throttle sensor/idle switch, fuel pressure regulator and
idle speed control systems. The throttle body controls the amount of air entering the engine by means of a butterfly valve at the bottom of its bore. Fuel is
sprayed from the injector directly on top of the throttle valve butterfly and then into the engine.