Go Back   Ford Truck Enthusiasts Forums > Older, Classic & Antique Trucks > 1987 - 1996 F150 & Larger F-Series Trucks
Sign in using an external account
Register Forgot Password?


1987 - 1996 F150 & Larger F-Series Trucks 1987 - 1996 Ford F-150, F-250, F-350 and larger pickups - including the 1997 heavy-duty F250/F350+ trucks

Reply
 
 
 
 
LinkBack Thread Tools Search this Thread
  #1  
Old 04-27-2010, 09:21 AM
wcamaddox wcamaddox is offline
New User
 
Join Date: Apr 2010
Posts: 2
wcamaddox is starting off with a positive reputation.
1994 5.8 high idle problem

Hello all, first posting. First of all I have read through several pages of useful info and searched for a similar problem before posting. I will admit I am new to the blue oval(dads retired from GM) so I dont have a lot of experience working on them. However, I have a 94 F-150 with the 5.8 and it is idling too high, drives fine except for when I do drive it it will be at 40mph.... checked for vacuum leaks, hoses as well as intake gaskets. no fuel in the line attached to the pressure regulator. cleaned and lubed the IAC according to another thread I had found on here to no avail. The one thing it does do is when I unplug the electrical connector from the IAC it idles down and dies. Any suggestions? Maybe check the TPS? Any help would be greatly appreciated!
Reply With Quote
  #2  
Old 04-27-2010, 10:13 AM
StephenHenry StephenHenry is offline
New User
 
Join Date: Feb 2006
Posts: 6
StephenHenry is starting off with a positive reputation.
I had a similar problem on my 96 5.8 (No OBDII) and it was the TPS, though it wasn't shifting correctly either, and would rarely go into third. As soon as I unplugged the TPS she settled right down, but didn't stall. Based on that, I replaced the sensor and everything has been fine since. Well, with the idle anyway.

Steve
Reply With Quote
  #3  
Old 04-27-2010, 10:22 AM
Lazy K Lazy K is offline
Post Fiend
 
Join Date: Jan 2005
Posts: 8,402
Lazy K is a name known to allLazy K is a name known to allLazy K is a name known to allLazy K is a name known to allLazy K is a name known to allLazy K is a name known to all
Ford Fuel Injection Throttle Position Sensor (TPS) Here is a link for info on the TPS. Stephen could well be right on that.
If you look on the right of that page you can click on Self Test for info on pulling trouble codes without a code reader.
Reply With Quote
  #4  
Old 04-27-2010, 11:46 AM
wcamaddox wcamaddox is offline
New User
 
Join Date: Apr 2010
Posts: 2
wcamaddox is starting off with a positive reputation.
Thank you all very much. I will definitely be getting the volt meter out and and checking the TPS!!
Reply With Quote
  #5  
Old 04-27-2010, 01:10 PM
ymeski56's Avatar
ymeski56 ymeski56 is offline
Postmeister
 
Join Date: Sep 2006
Location: Long Beach, Calimexiforia
Posts: 5,161
ymeski56 has a superb reputationymeski56 has a superb reputationymeski56 has a superb reputationymeski56 has a superb reputationymeski56 has a superb reputationymeski56 has a superb reputationymeski56 has a superb reputationymeski56 has a superb reputationymeski56 has a superb reputationymeski56 has a superb reputationymeski56 has a superb reputation
Anybody fiddled w/ the throttle adjust screw?
Reply With Quote
  #6  
Old 04-27-2010, 04:42 PM
rla2005's Avatar
rla2005 rla2005 is offline
Post Fiend
 
Join Date: Oct 2005
Location: Illinois
Posts: 8,388
rla2005 is a splendid one to beholdrla2005 is a splendid one to beholdrla2005 is a splendid one to beholdrla2005 is a splendid one to beholdrla2005 is a splendid one to beholdrla2005 is a splendid one to beholdrla2005 is a splendid one to behold
Quote:
Originally Posted by ymeski56 View Post
Anybody fiddled w/ the throttle adjust screw?
I don't think you want to go there. I do not usually take someone's word on anything unless it can be backed up with a manual. In this case I have read several manuals stating you do not want to "fiddle" with that screw. Steve83 posted a procedure for how to reset it quite some time ago.
Reply With Quote
  #7  
Old 04-27-2010, 05:11 PM
ymeski56's Avatar
ymeski56 ymeski56 is offline
Postmeister
 
Join Date: Sep 2006
Location: Long Beach, Calimexiforia
Posts: 5,161
ymeski56 has a superb reputationymeski56 has a superb reputationymeski56 has a superb reputationymeski56 has a superb reputationymeski56 has a superb reputationymeski56 has a superb reputationymeski56 has a superb reputationymeski56 has a superb reputationymeski56 has a superb reputationymeski56 has a superb reputationymeski56 has a superb reputation
Quote:
Originally Posted by rla2005 View Post
I don't think you want to go there. I do not usually take someone's word on anything unless it can be backed up with a manual. In this case I have read several manuals stating you do not want to "fiddle" with that screw. Steve83 posted a procedure for how to reset it quite some time ago.
It was a question, not a suggestion. That's why I said "Fiddled" instead of "adjusted". But I suppose someone might take it as a dare! Better safe than sorry! (and they would be)
Reply With Quote
  #8  
Old 04-27-2010, 05:26 PM
rla2005's Avatar
rla2005 rla2005 is offline
Post Fiend
 
Join Date: Oct 2005
Location: Illinois
Posts: 8,388
rla2005 is a splendid one to beholdrla2005 is a splendid one to beholdrla2005 is a splendid one to beholdrla2005 is a splendid one to beholdrla2005 is a splendid one to beholdrla2005 is a splendid one to beholdrla2005 is a splendid one to behold
Gotcha....my mistake for reading that wrong. But that is a good point and more than once an OP has found that to be the case. In this example the OP has disconnected the IAC and the idle drops, so I would say something is telling the IAC to open the throttle too far such as the TPS?
Reply With Quote
  #9  
Old 04-27-2010, 06:14 PM
ymeski56's Avatar
ymeski56 ymeski56 is offline
Postmeister
 
Join Date: Sep 2006
Location: Long Beach, Calimexiforia
Posts: 5,161
ymeski56 has a superb reputationymeski56 has a superb reputationymeski56 has a superb reputationymeski56 has a superb reputationymeski56 has a superb reputationymeski56 has a superb reputationymeski56 has a superb reputationymeski56 has a superb reputationymeski56 has a superb reputationymeski56 has a superb reputationymeski56 has a superb reputation
One of the two. or a horrendous unmetered air source. I was hoping to rule out "fiddling" now, instead of him copping to it, 2 pages of posts after he replaced the TPS to no avail! People think it's the same thing as back in the Carbed days. Nope. Rereading it, it did almost sound like a dare. Now I'm picturing him w/ a little devil on one shoulder saying, "Go ahead, give it a little turn. The first one's free! I too was thinking TPS, but if the set screw was adjusted then his TPS test reading would appear out of wack regardless of weather the sensor was actually good. Yes?
Reply With Quote
  #10  
Old 04-27-2010, 06:39 PM
rla2005's Avatar
rla2005 rla2005 is offline
Post Fiend
 
Join Date: Oct 2005
Location: Illinois
Posts: 8,388
rla2005 is a splendid one to beholdrla2005 is a splendid one to beholdrla2005 is a splendid one to beholdrla2005 is a splendid one to beholdrla2005 is a splendid one to beholdrla2005 is a splendid one to beholdrla2005 is a splendid one to behold
Yep, it sure would
Reply With Quote
Old 04-27-2010, 06:39 PM
 
 
 
Reply

Similar Threads
Thread Thread Starter Forum Replies Last Post
Idle air control question musicars 1987 - 1996 F150 & Larger F-Series Trucks 4 12-01-2013 06:50 PM
Warm 5.8L engine slow idles then dies bunruh 1987 - 1996 F150 & Larger F-Series Trucks 11 11-01-2013 07:24 PM
Aftermarket IAC Valve Jlckb5 1987 - 1996 F150 & Larger F-Series Trucks 8 11-07-2011 08:50 AM
High Idle still after replacing IAC unclethumbtack 1987 - 1996 F150 & Larger F-Series Trucks 2 05-10-2010 10:08 AM
Need help with High Idle problem (really long post) jcstratt 1997 - 2003 F150 3 02-01-2006 12:28 AM


Go Back   Ford Truck Enthusiasts Forums > Older, Classic & Antique Trucks > 1987 - 1996 F150 & Larger F-Series Trucks

Tags
1994, 30, 58, 94, adjustment, f150, fast, ford, high, iac, idle, idles, idling, problems, screw, tps

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


Participate In The Forums

Create new posts and participate in discussions. It's free!

Sign Up »





All times are GMT -5. The time now is 01:46 PM.


Powered by vBulletin® Version 3.8.7 AC1
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
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