Fuel Injectors

The PCM controls fuel injector "on" time (pulse width) to meter fuel quantity into intake ports. The PCM receives inputs from engine sensors to compute fuel flow necessary to maintain correct air/fuel operation throughout engine operating range.

Each cylinder has a solenoid-operated injector that sprays fuel toward each intake valve. Each injector receives battery voltage from main relay. PCM-controlled ground circuit is used to complete circuit and energize the injector. Fuel injectors "fire" sequentially (in engine firing order) once per complete cycle.

Injectors consist of solenoid-actuated pintle and needle valve assembly. Amount of fuel delivered to engine is regulated by length of time solenoid is energized (pulse width). Atomized spray pattern is obtained by shape of injector pintle.