Fuel Injector

Fuel Injector:

The fuel injector is an electromagnetic (solenoid) type injection nozzle which injects fuel into the throat (bore) of the Throttle Body Fuel Injection (TBI) unit.

The powertrain control module energizes the solenoid coil of the fuel injector, generating an electromagnet field that attracts the solenoid plunger. The needle valve, which is incorporated with the solenoid plunger, is opened by the movement of the solenoid plunger. The opening of the needle valve allows the fuel that is under pressure to disperse in a cone shaped (conic) pattern. Because the stroke of the needle valve in the fuel injector is set constant, the amount of fuel injected at one time is determined by the length of time the solenoid coil is energized (pulse width injection time).