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. ECM/PCM controls injection timing based on crankshaft position signal input. ECM/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.