early 99 runs good when cold then runs sluggish - Ford Powerstroke Diesel Forum
LinkBack Thread Tools Display Modes
post #1 of 2 Old 03-28-2014, 09:54 AM Thread Starter
Powerstroke.org Rookie
Join Date: Aug 2010
Posts: 22
Thanks: 0
Thanked 0 Times in 0 Posts
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
Feedback Score: 0 reviews
early 99 runs good when cold then runs sluggish

early 99 f350 7.3 auto. The truck is sluggish and then seems to get a big boost of power when pulling out from a stop. The power is on and off like a switch. At 1/4 throttle its almost like it down shifts, runs great until you let off the throttle a little and then it runs sluggish. It only does it when its 30 degrees or colder and only the first couple miles, after that it runs sluggish.

new map sensor, barometric sensor, rebuild turbo, under valve cover wiring, injector o rings, glow plugs, ebv sensor, cleaned tube.

Everything is stock except for a diy intake kit and diablo tuner, which i turned back to stock until i figure out the problem.

any ideas?
oteps is offline  
Sponsored Links
post #2 of 2 Old 04-02-2014, 06:43 AM
Powerstroke.org Rookie
Join Date: Apr 2014
Posts: 1
Thanks: 0
Thanked 0 Times in 0 Posts
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
Feedback Score: 0 reviews
Same deal

I have a 2001 PSD an I'm having a similar issue when cold it runs good but as it warms up it loses power. I have replaced inj. O-rings rebuilt the turbo new ICP sensor, new IPR. I replaced the HPOP but I found that it was for a 97 model, at WOT my pressure drops to 800/1000 lb but if I back off to 1/2 throttle PSI will jump to 2700/3000 lb under a load.
ne7342 is offline  
Sponsored Links

Quick Reply

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:
Please enter a password for your user account. Note that passwords are case-sensitive.


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:


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
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode

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

For the best viewing experience please update your browser to Google Chrome