1997 - 2006 Expedition & Navigator 1997 - 2002 and 2003 - 2006 Ford Expedition and Lincoln Navigator Discussion

high idle

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Mar 18, 2009 | 07:13 PM

#1

aa767man

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high idle

I got home today and put my 98 expedition in park, and it stayed idling at 2000 rpm. After i shut it off, and let sit for 5 mins and restarted it was fine.
Any ideas?

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Mar 18, 2009 | 07:53 PM

#2

alloro

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A sticking IAC valve or a leak in the PCV vacuum hose come to mind.

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Mar 18, 2009 | 08:09 PM

#3

aa767man

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Ok dumb question whats a ICA valve?

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Mar 19, 2009 | 02:16 AM

#4

c_hohensee

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Quote:

Originally Posted by aa767man

Ok dumb question whats a ICA valve?

The IAC valve or idle air control valve controls how much air is allowed into the mix at idle. It is a popular problem, that can be taken off and cleaned or replaced. The valve is attached to the plenum, either on the back side on a 5.4 or the front side of the plenum on a 4.6. It has a hose and wires plugged into it.

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46, air, control, ford, ica

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