E99 7.3 runs better when its on the colder side but loses power when warm - Ford Powerstroke Diesel Forum
User Tag List

 
LinkBack Thread Tools Display Modes
post #1 of 4 Old 12-04-2013, 11:47 AM Thread Starter
Member
 
chardnay10's Avatar
 
Join Date: Dec 2012
Location: Dundee, OR
Posts: 48
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Thanks: 0
Thanked 0 Times in 0 Posts
Feedback Score: 0 reviews
E99 7.3 runs better when its on the colder side but loses power when warm

Ive got an e99 7.3 that runs alot better when the motor is colder vs warm seems as it gets warmer i lose power. Any idea on why? I dont hot rod it when cold but i notice power is alot better cold than hot it has a ts 6 pos, intake, exhaust and has 246k miles

2005 F250 Lariat, SCT X3 with Gearhead tunes, PHP Atlas 40 FICM Tune, 4" Exhaust, K&N Intake, XDP Coolant Filter, EGR Delete, ARP Headstuds with OEM Gaskets, 5w-40 Full Synthetic oil, 8 inch Fabtech 4 link 4.0 Coilover lift. Pioneer deck with 12" Sub, LED Lights all over.
chardnay10 is offline  
post #2 of 4 Old 12-05-2013, 05:47 AM Thread Starter
Member
 
chardnay10's Avatar
 
Join Date: Dec 2012
Location: Dundee, OR
Posts: 48
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Thanks: 0
Thanked 0 Times in 0 Posts
Feedback Score: 0 reviews
anyone?...

2005 F250 Lariat, SCT X3 with Gearhead tunes, PHP Atlas 40 FICM Tune, 4" Exhaust, K&N Intake, XDP Coolant Filter, EGR Delete, ARP Headstuds with OEM Gaskets, 5w-40 Full Synthetic oil, 8 inch Fabtech 4 link 4.0 Coilover lift. Pioneer deck with 12" Sub, LED Lights all over.
chardnay10 is offline  
post #3 of 4 Old 12-05-2013, 06:23 AM
Compression Ignition Addict
 
Join Date: Dec 2007
Posts: 6,192
Mentioned: 5 Post(s)
Tagged: 0 Thread(s)
Quoted: 73 Post(s)
Thanks: 7
Thanked 232 Times in 223 Posts
Feedback Score: 3 reviews
What can happen is, and I'm not saying this is your problem without monitoring the engines sensors, because the injection system relies on oil and oil pressure to drive the injection system, that oil viscosity changing with temperature can have that effect.

What weight oil are you using? Thin Synthetics can show a failing HiPres Oil system early.

How long was the last oil change? Tired oil can foam and do this too.

I would want to get it on a good diagnostic scanner and watch the sensors as the engine heats-up to see if there are any drastic changes.
NoRalPh is offline  
post #4 of 4 Old 12-05-2013, 08:35 PM
Compression Ignition Addict
 
lookin4myPSD's Avatar
 
Join Date: Nov 2011
Location: Bradenton, Florida
Posts: 168
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Thanks: 8
Thanked 7 Times in 6 Posts
Feedback Score: 0 reviews
Change the oil. If that doesn't make a difference, then replace the injector o-rings. They can leak when they warm up. And I second the scanner. Watch ICP, ICP duty cycle, and do a buzz test just for S&G.

If you ever think something I post is ridiculous or uneducated, just remember that I probably learned it from here.


Early 99 F250 ECLB,
T-500, 6637, CCV Mod, Foil delete 4" downpipe to 5" straightpipe
TS 6 Position Chip (Will accept donations for custom tunes!), Bridgestone Dueler AT 285/75R16
Pro-comp Trans temp, Pyrometer, boost and HPOP gauges
lookin4myPSD is offline  
Reply

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:
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:
OR

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
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