1999 Ford F150 5.4L Running Rough at Idle - Ford F150 Forum - Community of Ford Truck Fans

Go Back   Ford F150 Forum - Community of Ford Truck Fans > Late Model F150s > 1997 - 2003 Ford F150
Log In 

1999 Ford F150 5.4L Running Rough at Idle

Thread Tools Search this Thread
Old 05-24-2010, 09:31 PM   #1
Junior Member
Join Date: May 2010
Posts: 2
Thanks: 0
Thanked 0 Times in 0 Posts
Feedback Score: 0 reviews
Default 1999 Ford F150 5.4L Running Rough at Idle

I have a 1999 f150 lariat with a 5.4L. It recently started running rough at idle so I replaced the pcv valve and fuel filter. After replacing these it still ran rough. I took it up to advanced auto and and had them do a check engine light read and it said 3 of the 4 o2 sensors were bad. I replaced all 4 o2 sensors and it ran fine for about a day and the check engine light came back on. I again took it up to advanced and had them hook it up and now its saying its running lean. I am alittle stumped and to short on cash to take it to a shop. I had thought maybe mass flow air sensor but I am not really sure. I would greatly appreciate any help.
1999f150lariat is offline   Reply With Quote
Old 05-24-2010, 09:31 PM
Join F150 Forum

Join F150Forum.com Today - It's Totally Free!

Are you a Ford F150 fan? If so we invite you to join our community and see what it has to offer. Our site is specifically designed for you and it's a great place for Ford F150 Fans to meet online.
Once you join you'll be able to post messages, upload pictures of your truck, and have a great time with other Ford F150 fans. Whether your an old timer or just bought your F150 you'll find that F150Forum.com is a great community to join. Best of all it's totally free!

Join F150Forum.com Today! - Click Here JOIN FOR FREE


Similar Threads
Thread Thread Starter Forum Replies Last Post
5.4 L 1999 F150 Running Rough at Idle 1999f150lariat Maintenance Shop 1 06-15-2010 05:51 PM
1999 F150 4.6 Very rough idle JNFORD General F150 Discussion 1 05-01-2009 03:04 PM
02 running rough at idle 02flaresidesport 1997 - 2003 Ford F150 2 04-06-2009 07:32 PM
04' 5.4 running rough at idle uaw1111 Engine / Drivetrain Talk 13 03-31-2009 09:56 PM
Ford F150 - Idle sometimes dragging down. 1999 4.6 Joey in IN 1997 - 2003 Ford F150 4 12-11-2007 10:55 PM

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

All times are GMT -4. The time now is 03:29 AM.

Copyright 2006 - 20011 F150forum.com
This site is in no way affiliated with the Ford Motor Company.