Go Back   Ford Truck Enthusiasts Forums > Newer Light Duty Trucks > Expedition & Navigator
Sign in using an external account
Register Forgot Password?


Expedition & Navigator 1997 - 2002 and 2003 - 2006 Ford Expedition and Lincoln Navigator SPONSORED BY:

Welcome to Ford-Trucks Forums!
Welcome to Ford-Trucks.com.

You are currently viewing our forums as a guest, which gives you limited access to view most discussions and access our other features. By joining our community you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is fast, simple and absolutely free so please, join the Ford-Trucks Forums community today!





 
Reply
 
LinkBack Thread Tools Search this Thread
  #1 (permalink)  
Old 08-13-2006, 12:07 AM
t_money662 t_money662 is offline
New User
 
Join Date: Jun 2006
Posts: 7
t_money662 is starting off with a positive reputation.
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
Reply With Quote
  #2 (permalink)  
Old 08-15-2006, 11:38 AM
gibsonj gibsonj is offline
Senior User
 
Join Date: Sep 2003
Location: north carolina
Posts: 291
gibsonj is starting off with a positive reputation.
Might be IAC. Check out this thread from the Explorer Forum:

http://www.ford-trucks.com/forums/16...pair-help.html
__________________
2K Expy EB, 97 Explorer, 92 F150
Reply With Quote
  #3 (permalink)  
Old 08-16-2006, 12:29 PM
t_money662 t_money662 is offline
New User
 
Join Date: Jun 2006
Posts: 7
t_money662 is starting off with a positive reputation.
Thanks, I will definately check the IAC valve with a multimeter for the proper resistances..
Reply With Quote
  #4 (permalink)  
Old 08-16-2006, 01:34 PM
Mr.Novice Mr.Novice is offline
Senior User
 
Join Date: Jan 2006
Location: North Texas
Posts: 289
Mr.Novice is starting off with a positive reputation.
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!
Reply With Quote
  #5 (permalink)  
Old 08-16-2006, 05:52 PM
Parts Guy Wyatt's Avatar
Parts Guy Wyatt Parts Guy Wyatt is offline
PLATINUM SPONSOR
 
Join Date: Jan 2006
Location: Seattle
Posts: 3,854
Parts Guy Wyatt has much to be proud ofParts Guy Wyatt has much to be proud ofParts Guy Wyatt has much to be proud ofParts Guy Wyatt has much to be proud ofParts Guy Wyatt has much to be proud ofParts Guy Wyatt has much to be proud ofParts Guy Wyatt has much to be proud ofParts Guy Wyatt has much to be proud ofParts Guy Wyatt has much to be proud of
*F65Z9F715HA FTE 65.09

Let me know if you need one.

Ed
__________________
Reply With Quote
  #6 (permalink)  
Old 08-18-2006, 03:00 PM
Thrower20 Thrower20 is offline
Freshman User
 
Join Date: Dec 2003
Posts: 27
Thrower20 is starting off with a positive reputation.
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
Reply With Quote
  #7 (permalink)  
Old 08-18-2006, 03:16 PM
Mr.Novice Mr.Novice is offline
Senior User
 
Join Date: Jan 2006
Location: North Texas
Posts: 289
Mr.Novice is starting off with a positive reputation.
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.
Reply With Quote
  #8 (permalink)  
Old 08-19-2006, 12:45 AM
buzzard's Avatar
buzzard buzzard is offline
Postmaster
 
Join Date: Oct 2000
Location: All over Texas
Posts: 3,942
buzzard is starting off with a positive reputation.
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.
__________________
Jim
Mac Haik is a Joke
1968 F250 CS, 390
Pebble Beige/Wimbledon White
2008 4x4 EB Expedition, White
Reply With Quote
  #9 (permalink)  
Old 08-19-2006, 01:20 PM
Mr.Novice Mr.Novice is offline
Senior User
 
Join Date: Jan 2006
Location: North Texas
Posts: 289
Mr.Novice is starting off with a positive reputation.
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...
Reply With Quote
  #10 (permalink)  
Old 08-21-2006, 02:03 PM
ghman ghman is offline
New User
 
Join Date: Aug 2006
Posts: 1
ghman is starting off with a positive reputation.
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?
Reply With Quote
  #11 (permalink)  
Old 08-21-2006, 02:58 PM
Mr.Novice Mr.Novice is offline
Senior User
 
Join Date: Jan 2006
Location: North Texas
Posts: 289
Mr.Novice is starting off with a positive reputation.
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
Reply With Quote
  #12 (permalink)  
Old 08-22-2006, 05:55 AM
IB Tim's Avatar
IB Tim IB Tim is online now
Site Administrator
 
Join Date: Jan 2003
Location: 3rd Rock
Posts: 111,599
IB Tim has a superb reputationIB Tim has a superb reputationIB Tim has a superb reputationIB Tim has a superb reputationIB Tim has a superb reputationIB Tim has a superb reputationIB Tim has a superb reputationIB Tim has a superb reputationIB Tim has a superb reputationIB Tim has a superb reputationIB Tim has a superb reputation
...Welcome ghman, to Ford Truck Enthusiasts!

See you on the boards. ….
__________________
Administrator
tim.lamkin@internetbrands dot com
Life is not only time……paradoxically, it is the denial of time!
What lies behind us and what lies before us are tiny matters compared to what lies within us.

When you are down...look up...get up...and don't ever give up....
Reply With Quote
Old 08-22-2006, 05:55 AM
Reply

Go Back   Ford Truck Enthusiasts Forums > Newer Light Duty Trucks > Expedition & Navigator

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are On
Forum Jump



All times are GMT -5. The time now is 04:28 AM.


Powered by vBulletin® Version 3.7.5
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
SEO by vBSEO 3.5.2 ©2010, Crawlability, Inc.
Advertising - Terms of Use - Privacy Statement - Jobs
This forum is owned and operated by Internet Brands, Inc., a Delaware corporation. It is not authorized or endorsed by the Ford Motor Company and is not affiliated with the Ford Motor Company or its related companies in any way. Ford® is a registered trademark of the Ford Motor Company.

vbulletin Admin Backup