Fuel Control (Fuel Injected): Injector

The fuel injector consists of a solenoid, plunger needle valve, and housing. When current is applied to the solenoid coil, the valve lifts up and pressurized fuel is injected close to the intake valve. Since the needle valve lift and the fuel pressure are constant, the air/fuel ratio is determined by the length of time that the valve is open (duration of current supplied to solenoid coil). On TBI models, injector is sealed by 2 "O" rings and a mount rubber. On PFI models, injector is sealed by an "O" ring and seal ring at each end (top and bottom). All seals, "O" rings and mount rubbers help to reduce injector operating noise and heat transfer.