Injectors — General Information (Escort 4)

The fuel injector, centrally mounted in the CFI unit, is a solenoid valve that delivers a specific dose of fuel for the corresponding engine load condition. This dose of fuel in the form of finely atomized particles is sent directly to the intake manifold.

To operate the injector, the EEC-IV device produces two different signals: one high current signal to lift the jet needle off its seat and another low current signal (via the unloading resistance) to hold the valve open.

At idle, the injector is activated at every second suction stroke, while the vehicle is moving – at every suction stroke. In this case, the injector is under constant fuel pressure, which is provided by the fuel pump and maintained by the pressure regulator.

[The original source of this article can be found at: FordBook]