Idle problems..Surges up and down?
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New User
Joined: Jun 2006
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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
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
Tuned
Joined: Sep 2003
Posts: 296
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From: north carolina
Might be IAC. Check out this thread from the Explorer Forum:
https://www.ford-trucks.com/forums/1...pair-help.html
https://www.ford-trucks.com/forums/1...pair-help.html
Senior User
Joined: Jan 2006
Posts: 289
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From: North Texas
Also check out this recent thread:
https://www.ford-trucks.com/forums/5...-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!
https://www.ford-trucks.com/forums/5...-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!
Freshman User
Joined: Dec 2003
Posts: 27
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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
120K, 5.4L, 3" w/ a 50 series Flowmaster, UNI Filter
Rodney
120K, 5.4L, 3" w/ a 50 series Flowmaster, UNI Filter
Senior User
Joined: Jan 2006
Posts: 289
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From: North Texas
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
Rodney
120K, 5.4L, 3" w/ a 50 series Flowmaster, UNI Filter
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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Logistics Pro
Joined: Oct 2000
Posts: 3,960
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From: All over Texas
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.
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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Senior User
Joined: Jan 2006
Posts: 289
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From: North Texas
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...
I replaced IAC last night - Problem solved. I still have a brand new TPS if anybody needs one...
Senior User
Joined: Jan 2006
Posts: 289
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From: North Texas
Originally Posted by ghman
where is the iac located on a navigator?
https://www.ford-trucks.com/article/...r_IAC_Fix.html
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