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  #1  
Old 08-13-2006, 01:07 AM
t_money662 t_money662 is offline
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Idle problems..Surges up and down?

Within the last couple of weeks, my 2001 Expedition (4.6L) has had some idle issues...
When I am in drive, and come to a stop, like at a red light, the engine seems to surge up and down. This doesn't happen when in park, only when in gear, and is starting to worry me.
What is this a symptom of?
thanks alot
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  #2  
Old 08-15-2006, 12:38 PM
gibsonj gibsonj is offline
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Might be IAC. Check out this thread from the Explorer Forum:

http://www.ford-trucks.com/forums/16...pair-help.html
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Old 08-16-2006, 01:29 PM
t_money662 t_money662 is offline
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Thanks, I will definately check the IAC valve with a multimeter for the proper resistances..
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Old 08-16-2006, 02:34 PM
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Also check out this recent thread:
http://www.ford-trucks.com/forums/51...-ac-is-on.html

I was reading in my Chilton manual last night how the IAC works with the A/C. Sounds more and more like an IAC.
Please let us know if/how you fix this problem.

Thanks!
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Old 08-16-2006, 06:52 PM
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Old 08-18-2006, 04:00 PM
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I am having the same issues with my 98'. Could it be the TPS, I read the voltage and the closed position reads .05 higher than the top end of the range. Any ideas or should I be looking into the IAC also.

Rodney

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Old 08-18-2006, 04:16 PM
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Quote:
Originally Posted by Thrower20
I am having the same issues with my 98'. Could it be the TPS, I read the voltage and the closed position reads .05 higher than the top end of the range. Any ideas or should I be looking into the IAC also.

Rodney

120K, 5.4L, 3" w/ a 50 series Flowmaster, UNI Filter
Hi Rodney,

I happen to have a brand new TPS. I'm gonna throw it on this weekend and I'll let you know what happens.

If that doesn't fix it, I'll replace the IAC.
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Old 08-19-2006, 01:45 AM
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If it's the IAC then you'll experience the symptoms in "park" as well, especially right at start-up...I'm betting on the TPS.

FWIW, mine surged in gear, like you mention, a couple times around 60K miles ago and hasn't done it since.
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Old 08-19-2006, 02:20 PM
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Thumbs up Solution!!!

Buzzard, it won't necessarily do it in Park even though it does it in drive if it's the IAC that's going out.

I replaced IAC last night - Problem solved. I still have a brand new TPS if anybody needs one...
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Old 08-21-2006, 03:03 PM
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iac??

I have a '99 navigatior that won't idle. The computer gave a code of the mass air flow sensor so i changed that out and it still doesn't idle. where is the iac located on a navigator?
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Old 08-21-2006, 03:58 PM
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Quote:
Originally Posted by ghman
where is the iac located on a navigator?
Remove the "4.6" or "5.4" cover on your throttle body. On my 4.6, the IAC on the top-right side of the throttle body. I think it's on the opposite side on the 5.4's but don't quote me on that. It looks a lot like this (even though the link is for Explorers):

http://www.ford-trucks.com/article/i...r_IAC_Fix.html
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Old 08-22-2006, 06:55 AM
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Old 08-22-2006, 06:55 AM
 
 
 
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