98 Ford Expedition - Rough Idle - Ford Truck Enthusiasts Forums



Illinois Chapter Join Chapter Leader: KOESTNER

98 Ford Expedition - Rough Idle

Reply
 
 
 
Thread Tools Search this Thread
  #1  
Old 11-23-2004, 10:31 AM
tmcd tmcd is offline
New User
Thread Starter
 
Join Date: Nov 2004
Posts: 3
tmcd is starting off with a positive reputation.
98 Ford Expedition - Rough Idle

I have a 98 ford expedition 5.4L w/107K miles. It began to idle roughly, with RPM's fluctuating and stalling at times. Check engine light is on with codes p0171 and p0174 (too lean). I have also had intermitten check engine light come on for p0153 (slow O2 sensor). I've read various info on the internet about Mass Air Flow sensors and IAC motor. Is there a definitive answer for these 171/174 codes?

Last edited by tmcd; 11-23-2004 at 10:36 AM.
Reply With Quote
  #2  
Old 11-23-2004, 04:34 PM
Fastronald's Avatar
Fastronald Fastronald is offline
Elder User
 
Join Date: Aug 2004
Location: Palos Heights
Posts: 790
Fastronald is starting off with a positive reputation.
Welcome

Welcome to the site and the Illinois Chapter. I'm sure you will find good advice and suggestions here on your problem. Fairmontman is our chapter tech coordinator, if he sees this he may have your answer. Where are you in Illinois?
Some of us may have a shop recommedation if needed. If you are in the Chicago western suburbs, I can send you to a good repair shop in Darien.

Fastronald - Illinois Chapter Leader
Reply With Quote
  #3  
Old 11-23-2004, 05:39 PM
tmcd tmcd is offline
New User
Thread Starter
 
Join Date: Nov 2004
Posts: 3
tmcd is starting off with a positive reputation.
I'm in south elgin.
Reply With Quote
  #4  
Old 11-23-2004, 08:39 PM
fairmontman fairmontman is offline
Junior User
 
Join Date: Sep 2004
Posts: 89
fairmontman is starting off with a positive reputation.
Iac motors are common problems,especially with higher milage.Sometimes they can be cleaned.You may want to try cleaning the throttle body also.Most parts stores have throttle body cleaner.It may also have a bad o2 sensor if it's throwing that code,but I would start with cleaning the iac and throttle body first.Also make sure the spark plugs and wires are ok. Bob
Reply With Quote
  #5  
Old 12-21-2004, 04:45 PM
tmcd tmcd is offline
New User
Thread Starter
 
Join Date: Nov 2004
Posts: 3
tmcd is starting off with a positive reputation.
Smile 98 Expedition - Rough Idle Codes 0171 + 0174 Solved!

Thanks for your help on this site. A vacuum hose on the passenger side of the engine going back down between the engine and the firewall had a huge hole on the inside of the 90 degree angle going into the engine. The material at the bend in the hose was disintegrated. Replaced the hose and it runs better than it has in a long time.
Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
98 expedition p1747 ephexpi Clutch, Transmission, Differential, Axle & Transfer Case 3 08-17-2016 12:10 AM
98 expedition engine surging gnoon 1997-2006 Expedition & Navigator 4 05-24-2016 11:23 PM
intermit. rough idle, check engine w/ P0171 & P0174 codes hhoelsc 1997-2006 Expedition & Navigator 152 04-01-2016 09:26 AM
03 Expedition: Codes P2195, P2197 and P0171 MCGA 1997-2006 Expedition & Navigator 10 07-23-2012 10:21 PM
'98 Expedition -six OBD codes D-man13 1997-2006 Expedition & Navigator 3 09-28-2007 12:33 PM


Go Back   Ford Truck Enthusiasts Forums > >

Tags
54l, 97, 98, 99, code, expedion, expedition, ford, idle, idling, o2, p0153, problems, rough, sensor

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 Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Forum Jump


All times are GMT -5. The time now is 12:15 AM.