LIMP MODE, 04 6.0 limp-mode, derate mode, de-fueling... please help - Ford Powerstroke Diesel Forum
Powerstroke.org is the premier Diesel Truck Forum on the internet. Registered Users do not see the above ads.
Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 01-12-2014, 08:10 PM
Member
 

Join Date: Oct 2013
Location: West Palm Beach
Posts: 35
Thanks: 0
Thanked 0 Times in 0 Posts
Feedback Score: 0 reviews
[SOLVED] LIMP MODE, 04 6.0 limp-mode, derate mode, de-fueling... please help

Long time reader, new member because im really at a loss. I got a 2004 F350 6.0 that's going into limp mode, or derate mode, or de-fueling whatever its called. when the truck reaches operating temp it wont rev past 2500 rpm, has plenty of power, and I can still drive on the highway, if I shut it down and restart its fine for several seconds, does it again. it never fails, if I drive easy the whole time or if I beat that crap out of it once it warms up it goes limp (that's what she said). ive heard multiple opinions on what would cause this. the truck is completely stock with the egr unplugged (it was doing it before I unplugged the egr), and no check engine light and no codes stored according to my scangauge 2. here is what ive done/checked so far.

fresh oil/filter
replaced both fuel filters (autozone, was doing it before filter change)
Checked FICM voltage, doesnt drop below 47.5v
Checked FICM sync, in sync (1)
checked oil pressure, 590psi at idle, almost 4000psi at WOT
checked boost, 0-3psi at idle, just over 20psi at WOT
checked fuel pressure, 56-58psi continuously
checked ECT and EOT, when it went limp EOT was at 158 degrees, ECT was
at 166 degrees, but both stayed reasonably close together
checked MAP sensor, idle 15.1, high idle was the same, WOT went up to 21 before I had to let off the throttle
checked EBP sensor, idle 17.1, high idle 18.9, WOT went up to 32 before
I had to let off the throttle
I really don't know what the MAP and EBP readings mean

I don't really know what else I should be looking at, and help would be really appreciated.

SOLVED: BAD EBP SENSOR - truck thought it was boosting 40psi

Last edited by mkeevo; 01-22-2014 at 10:59 AM. Reason: change title, added ficm voltage and ficm sync
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2  
Old 01-13-2014, 05:36 AM
Member
 

Join Date: Oct 2013
Location: West Palm Beach
Posts: 35
Thanks: 0
Thanked 0 Times in 0 Posts
Feedback Score: 0 reviews
bump...anyone?
Reply With Quote Quick reply to this message
  #3  
Old 01-13-2014, 05:41 AM
Compression Ignition Addict
 

Join Date: Mar 2008
Location: FL
Posts: 4,215
Thanks: 20
Thanked 24 Times in 15 Posts
Feedback Score: 0 reviews
Are you running a Motorcraft oil filter and an OEM cap?

.
Reply With Quote Quick reply to this message
  #4  
Old 01-13-2014, 06:01 AM
Member
 

Join Date: Oct 2013
Location: West Palm Beach
Posts: 35
Thanks: 0
Thanked 0 Times in 0 Posts
Feedback Score: 0 reviews
Quote:
Originally Posted by Snake View Post
Are you running a Motorcraft oil filter and an OEM cap?

.
no its a bosch filter, but it was doing it before the oil change, and my high oil pressure is good
Reply With Quote Quick reply to this message
  #5  
Old 01-13-2014, 06:08 AM
Compression Ignition Addict
 

Join Date: Dec 2008
Location: port arthur texas
Posts: 3,281
Thanks: 0
Thanked 11 Times in 11 Posts
Feedback Score: 0 reviews
Snake your pretty knowledgeable I know there is a high temp limit that will put you in defuel but is there a low side limit?

I mean he seems to be running awfully cold eot and ect unless he is in a -35 deg. ambient.

Just wondering.
Reply With Quote Quick reply to this message
  #6  
Old 01-13-2014, 06:33 AM
Member
 

Join Date: Oct 2013
Location: West Palm Beach
Posts: 35
Thanks: 0
Thanked 0 Times in 0 Posts
Feedback Score: 0 reviews
Quote:
Originally Posted by dannyboy950 View Post
Snake your pretty knowledgeable I know there is a high temp limit that will put you in defuel but is there a low side limit?

I mean he seems to be running awfully cold eot and ect unless he is in a -35 deg. ambient.

Just wondering.
actually im in S. Florida so yah, 80 degrees outside, and those readings are what i took when it first starts to happen, im sure i can get it hotter, although i do drive around and it doesnt stop unless i cycle the key
Reply With Quote Quick reply to this message
  #7  
Old 01-13-2014, 06:54 AM
Compression Ignition Addict
 

Join Date: Dec 2008
Location: port arthur texas
Posts: 3,281
Thanks: 0
Thanked 11 Times in 11 Posts
Feedback Score: 0 reviews
Gotta go to the doctor for a few hrs but I am gonna think on this a bit.
Reply With Quote Quick reply to this message
  #8  
Old 01-13-2014, 07:28 AM
Member
 

Join Date: Oct 2013
Location: West Palm Beach
Posts: 35
Thanks: 0
Thanked 0 Times in 0 Posts
Feedback Score: 0 reviews
Quote:
Originally Posted by dannyboy950 View Post
Gotta go to the doctor for a few hrs but I am gonna think on this a bit.
thanks.... i have to make my message at least 10 characters
Reply With Quote Quick reply to this message
  #9  
Old 01-13-2014, 10:47 AM
Member
 

Join Date: Oct 2013
Location: West Palm Beach
Posts: 35
Thanks: 0
Thanked 0 Times in 0 Posts
Feedback Score: 0 reviews
does anyone know if trans temp will make it go into limp mode
Reply With Quote Quick reply to this message
  #10  
Old 01-14-2014, 01:13 PM
Member
 

Join Date: Oct 2013
Location: West Palm Beach
Posts: 35
Thanks: 0
Thanked 0 Times in 0 Posts
Feedback Score: 0 reviews
Quote:
Originally Posted by mkeevo View Post
does anyone know if trans temp will make it go into limp mode
Anyone?


Sent from AutoGuide.com Free App
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
Reply

Tags
6.0, de-fueling, derate mode, limp-mode

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Ford Powerstroke Diesel Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
If you do not want to register, fill this field only and the name will be used as user name for your post.
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Thread Tools
Display Modes

Posting Rules
You may post new threads
You may 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 On
Pingbacks are On
Refbacks are On



All times are GMT -8. The time now is 04:03 PM.


Powered by vBulletin® Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Search Engine Optimization by vBSEO 3.6.1
Garage Plus, Vendor Tools vBulletin Plugins by Drive Thru Online, Inc.

vB.Sponsors