Fuel Injector: Description and Operation

Fuel Injector:

The fuel injectors are electro-mechanical devices which both meter and atomize fuel delivered to the engine. The fuel injectors are mounted in the lower intake manifold and positioned so that their tips are directing fuel at the back face of the intake valve. The body of the injector is a solenoid-actuated valve assembly. Fuel flow to the engine is regulated by how long the solenoid is energized. An electrical signal from the Powertrain Control Module (PCM) activates the solenoid, causing the needle valve to move inward off the seat, allowing the fuel to flow through the orifice. Atomization of the fuel is obtained by a director/metering plate where the fuel leaves the fuel injector.