Ford Focus Forum, Ford Focus ST Forum, Ford Focus RS Forum - View Single Post - IAC valve plunger.....
View Single Post
Old 01-22-2013, 09:24 PM   #3
Focus Addict
Join Date: Sep 2007
Fan#: 50210
Location: SoCal, CA
What I Drive: 2000 SE Wagon

Posts: 1,424
Points 4,058, Level 40
Points: 4,058, Level: 40 Points: 4,058, Level: 40 Points: 4,058, Level: 40
Level Up 54% Completed
Level up: 54% Level up: 54% Level up: 54%
Forum Activity 2%
Activity: 2% Activity: 2% Activity: 2%
FF Reputation: 11 emsvitil Great Standing Member
Buy-Sell-Trade Rating: (0)
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............
emsvitil is offline  
    Reply With Quote