Fuel Injector

Fuel Injector:

The fuel injector is an electromagnetic (solenoid) type injection nozzle which injects fuel into the intake port of the cylinder head according to the signals from the Powertrain Control Module (PCM). There are a total of four fuel injectors, one for each cylinder, located between the intake manifold and the fuel rail.

When the solenoid coil (1) of the fuel injector is energized by the PCM, it becomes an electromagnet and attracts the solenoid plunger (2). During this time, the needle valve (3), which is incorporated with the plunger, opens and the fuel injector, which is under fuel pressure, injects the fuel. 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).