Fuel Injector(s)
Sidekick MFI uses Multiport Fuel Injection (MFI), which incorporates 4 fuel injectors mounted in a fuel rail assembly. MFI system injects fuel into each cylinder head intake port.
When the solenoid coil of injector is energized by ECM, coil becomes an electromagnet. See Fig 1 . This lifts injector plunger, allowing fuel under pressure to be injected into cylinder head. Since fuel pressure is relatively constant, air/fuel mixtures are controlled by injector pulse width ("on" time). ECM determines proper pulse width based upon input signals received from various sensors and switches.
Timing of injector firing is determined by ECM based upon ignition signals from either distributor or ignition coil.