Civic Sedan L4-1493cc 1.5L SOHC (D15B2) TBI (1989)
Fuel Injector: Description and Operation
Fig. 21 Fuel Injectors (Throttle Body)
The injectors are the solenoid-actuated constant-stroke pintle type consisting 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. Because the needle valve lift and the fuel pressure are constant, the injection
quantity is determined by the length of time that the valve is open or the "ON" time (the duration the current is applied to the solenoid coil). The
injector is sealed by an O-ring and seal ring at the top and the bottom. These seal rings also reduce operating noise.