Fuel Injector: Description and Operation

PURPOSE
The fuel injectors are electro-mechanical devices which both meter and atomize fuel delivered to the engine.

OPERATION
An electrical control signal from the Powertrain Control Module (PCM) activates the injector solenoid, allowing fuel to flow. Since the fuel injector flow orifice is fixed and the fuel pressure drop across the injector tip is constant, fuel flow to the engine is regulated by how long the solenoid is energized. Atomization is obtained at the end cap.

CONSTRUCTION
The fuel injector bodies consist of a solenoid, a needle and valve assembly, and an end cap.