Fuel Injectors

A fuel rail links the fuel pressure regulator with the fuel injectors. Each cylinder is provided with a solenoid-operated injector which sprays fuel toward backside of each inlet valve. Each injector is energized through the ignition coil and grounded through the ECU/ECM to complete the circuit.

Each injector is linked to a resistor (resistor may be external or integral with injector or ECU/ECM) to reduce operating voltage to 3 volts and to protect injectors from power surges. The ECU/ECM controls length of time each injector is open. The ON time of the injector governs the amount of fuel delivered. The injector delivers 1/2 the amount of fuel required for an operating cycle each time they open (twice per cycle).