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The Idle air control valve is commonly called the IAC, or Idle air bipass valve IAB when it fails electrically, or gets gummed up and sticky, it won't properly control air into the engine and the engine's idle will suffer.
The engine may be hard to start. A faulty IAC may not throw a diagnostic troubleshooting code.
What does the IAC do? How does it work?
Ford Fuel Injection
Check and clean your IAC
Ford Explorer IAC Fix .: Articles
TheOldWizard Has some issues with the video I'll link to below, and while I agree with him, I think that overall the video is helpful and worth looking at.
[ame=http://www.youtube.com/watch?v=406BTo4JE3A&feature=player_embedded]YouTube - Emission System - Idle Air Control Motor Testing & Replacing - 1 of 2[/ame]
The engine may be hard to start. A faulty IAC may not throw a diagnostic troubleshooting code.
What does the IAC do? How does it work?
Ford Fuel Injection
Check and clean your IAC
Ford Explorer IAC Fix .: Articles
TheOldWizard Has some issues with the video I'll link to below, and while I agree with him, I think that overall the video is helpful and worth looking at.
youtube videotheoldwizard said:First, the example Idle Air Control/Bypass (IAC/IAB) motor they showed during most of the video is very different from the style used on most (all?) Ford vehicles. They showed a Ford design briefly and described it as one with an internal pintle.
Second, they said specifically not to spray cleaner on IAC with internal pintles. BS ! Any carb cleaner will work. Most will dry quickly. Just make certain to not leave any gunk.
Third, I have seen IACs work properly when warm, but stick when cold so their suggested testing procedures may not be perfect. In other words, you could pass all of the tests and still have a sticking IAC when cold.
[ame=http://www.youtube.com/watch?v=406BTo4JE3A&feature=player_embedded]YouTube - Emission System - Idle Air Control Motor Testing & Replacing - 1 of 2[/ame]