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 ratio throughout engine operating range.

Each cylinder has a solenoid-operated injector that sprays fuel toward each intake valve. Each injector receives battery voltage through an ignition switch circuit. The PCM-controlled ground circuit is used to complete the circuit and energize the injector. Each fuel injector fires 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. This period is known as pulse width. Atomized spray pattern is obtained by shape of pintle.