Fuel Injection Timing
WARNING: This page is about a different car, the 2004 Ford Ranger. However, it is still accessible from the selected car via links, so may be relevant.
The period of time the fuel injectors are energized is controlled by the PCM.
The pulse width is determined by inputs from the:
- Heated oxygen sensor (HO2S)
- Mass air flow sensor
- Engine coolant temperature (ECT) sensor
- Camshaft synchronizer
- Intake air temperature (IAT) sensor
- Between idle and 6,500 RPM, the fuel is injected to each cylinder independently by giving one injection per two crankshaft rotations (one injection per cycle) to all cylinders.
- Fuel injection for each cylinder takes place during its exhaust stroke.
- Above 6,500 RPM, fuel is cut to prevent engine overspeeding and possible engine damage.FUEL INJECTION SPECIFICATION
Engine Speed (RPM) Fuel Injection Cranking 2 Injections/1 Crankshaft Rotation (Simultaneous Injection to All Cylinders) Idle to 6,500 1 Injection/2 Crankshaft Rotations (Sequential Injection to Each Cylinder) Above 6,500 Fuel Cut Fail-Safe 1 Injection/2 Crankshaft Rotations (Simultaneous Injection to All Cylinders)