Fuel Injectors

Four HP fuel injectors are used. Each injector is side mounted in a port in the cylinder head. The fuel injectors are a push fit in the fuel rails and the cylinder heads. On each fuel injector, a rubber O-ring and support disc seals the head of the fuel injector in the fuel rail. A Teflon combustion seal ring seals the nozzle of the fuel injector in the cylinder head. The fuel rail provides positive location of each injector.

The injectors have seven holes for precisely controlled injection into each cylinder. Each fuel injector contains a solenoid-operated needle valve, which opens when the solenoid winding is energized. While the needle valve is open, fuel is sprayed into the combustion chamber. The solenoid winding is connected to a power feed and a ground from the ECM. The ECM meters the amount of fuel injected into the combustion chambers by adjusting the time that the solenoid winding is energized.

If a fuel injector fails, the engine will suffer from unstable idle speed, poor NVH (noise, vibration and harshness) and poor emissions performance. The engine MIL (malfunction indicator lamp) in the instrument cluster will also be illuminated.

Each injector uses a 12V supply from the ECM. However, hardware in the ECM pulls the voltage up to a 65V peak for half a millisecond and then holds it at 12V for the remainder of the injection event.