Fuel Injector: Description and Operation

Injectors







A multiport fuel injection system (MFI) is used, one injector per cylinder. Each injector consists of a small solenoid which is activated by the ECM to allow a metered amount of fuel to pass into the combustion chamber. Due to the pressure in the fuel rail and the shape of the injector orifice, the fuel squirts into the cylinder in a fine spray to aid combustion. In the unlikely event of injector failure a misfire will occur as there will be no fuel to the affected cylinder. The fault is indicated by illumination of the malfunction indicator light (MIL) on North American specification vehicles.