[olddog]

The reason for my initial question was that a dyno tuner, that I was interviewing for the job, claimed an EEC4 uses both timing and IAC to control the idle. Well that seemed wrong to me and counter to everything I have read. So either this guy knows more than everyone else, or he is not the guy I was looking for.

I managed to find a copy of ford documentation on the program code that runs in the EEC4. I can find nothing about timing being changed to control the idle speed. That is strictly a function of the IAC.

UPDATE:
Oh no I am flat wrong! I did find in the ford manual where they do indeed use timing to help control idle speed. Sounds like this guy knows more than many people, including me.