Focus Fanatics - View Single Post - IAC valve plunger.....
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Old 01-22-2013, 09:24 PM   #3
emsvitil
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Join Date: Sep 2007
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Location: SoCal, CA
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The ford IAC's use Pulse Width Modulation (PWM) to vary how far the plunger opens.

If 12 volts fully opens the plunger 6 volts will open it halfway. With PWM of 50% on, 50% off, the solenoid thinks it's getting 6 volts.

The ECM varies the PWM to open/close the IAC, and remembers where it was before as a starting point.


I just want to know if partially open is the starting point........

I get about 1/8" of travel from the starting point to fully open. (or as open as it's going to get).

If that's correct, I'm good. The plunger doesn't seem as sticky as when I started, so I may be fine now............
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