f150 rough idle and engine codes. - Ford F150 Forum - Community of Ford Truck Fans

Engine / Drivetrain Talk 6 or 8 Cylinders? Come talk about it.

f150 rough idle and engine codes.

Thread Tools Search this Thread
Old 10-29-2009, 11:09 PM   #3
Join Date: Jan 2009
Location: L.A. of Colorado
Posts: 89
Thanks: 0
Thanked 1 Time in 1 Post

Fuel pressure regulator? Pull the vacuum line off, and see if it is leaking fuel into the vacuum side.
oldmanb777 is offline   Reply With Quote
Old 10-30-2009, 10:45 PM   #4
Junior Member
Join Date: Oct 2009
Posts: 3
Thanks: 0
Thanked 0 Times in 0 Posts
Thumbs up

i had a problem with my 2004 5.4l stalling/rough idle, i have an after market intake. I pulled the throttle body and dscovered a lot of black greasy dirty film on the back side of the butterfly valve. a bit of carb cleaner and a towel to remove the film fixed the problem. Good luck!!!!!
lafd0101 is offline   Reply With Quote
Old 10-31-2009, 12:57 AM   #5
Junior Member
Join Date: Sep 2009
Posts: 18
Thanks: 0
Thanked 0 Times in 0 Posts

I had the same problem with the 5.4 and a cold air intake as well. The elbow was on a slightly off set angle and it caused me to idle like I had open headers and stall out at red lights.
stevelaramie is offline   Reply With Quote
Old 11-03-2009, 03:39 PM   #7
Senior Member
Join Date: Feb 2008
Location: Henderson, NV.
Posts: 4,656
Thanks: 0
Thanked 19 Times in 19 Posts

The 2000 thru 2003 4.2L has a TSB about the isolator bolts securing the plastic plenium chamber leaking causing the two codes. Its a pricey fix, about $150.00 for the parts. Takes a good 2-3 hours to do. Its not hard, just awkward to get at some of the crap. Note, the firewall sound deadener nees to be cut by the heater hoses for more clearance. Give me a PM if interested in more info.
Good old Bill is offline   Reply With Quote

Related Topics
Thread Thread Starter Forum Replies Last Post
Rough Idle/Misfiring - HELP! (2006 F150 5.4L v8) carp104 2004 - 2008 Ford F150 53 01-17-2018 09:59 AM
Rough Idle At Operating Temp While In Gear ericarrendale 1997 - 2003 Ford F150 11 09-15-2015 04:56 PM
High idle issue Aleakydishwasher 4.6L 3V 0 09-04-2015 11:23 AM
Idle Duration cod 2015 - Present Ford F150 0 09-03-2015 10:25 AM
What should be the rpm idle? crazyrwe General F150 Discussion 3 09-02-2015 10:50 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 04:33 PM.

Copyright 2006 - 2017 F150Forum.com We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
  • Ask a Question
    Get answers from community experts
Question Title:
Your question will be posted in: