The idle control valve works by letting air leak into the intake manifold in a controled manner or modulating it. The Idle Control processor controls this along with the ECU. You can easily tell if the ICV is working properly by unplugging it. If the idle speed increases, it's working. It might be a good idea to clean it.

The EHA on the fuel distributor modulates the fuel pressure between the upper and lower chamber if the FD, under control of the ECU.

The O2 sensor tells the ECU just how much to modulate the EHA.

The fuel pump relay has a processor inside to turn on the pump and activate the cold start valve.

__________________
Regards

Warren

Currently 1965 220Sb, 2002 FORD Crown Vic Police Interceptor

Had 1965 220SEb, 1967 230S, 280SE 4.5, 300SE (W126), 420SEL

ENTER > = (HP RPN)

Not part of the in-crowd since 1952.