Sequential Fuel Injection (SFI)

Individual, electrically pulsed injectors (one per cylinder) are located between intake manifold and fuel rails. These injectors are next to intake valves in intake manifold. PCM controls injection timing based on crankshaft position signal input. PCM regulates air/fuel mixture by length of time injector stays open (pulse width) based on inputs from HO2S, ECT sensor, MAP and other sensors.