Loss of MPG's - Ford Powerstroke Diesel Forum
User Tag List

LinkBack Thread Tools Display Modes
post #1 of 3 Old 09-13-2011, 10:40 PM Thread Starter
Powerstroke.org Rookie
OldRedFord4x4's Avatar
Join Date: Sep 2011
Location: Conyers GA
Posts: 6
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Thanks: 0
Thanked 0 Times in 0 Posts
Feedback Score: 0 reviews
Send a message via AIM to OldRedFord4x4
Loss of MPG's

Something I have noticed after I changed out the water pump and radiator, my fuel mileage has dropped a good amount and the engine also runs cooler now. My MPG's are down from 17-18 to 12-10. The temp gauge used to atleast hit the N in normal. Now the needle doesn't get near that spot.

I thought after a oil change and new fuel filter my fuel mileage might pick up a tick or so or stay the same. Not drop. I keep the truck under 2000 rpms and hardly ever go above 60 mph.

I am wondering if I have the wrong thermostat and its causing the engine to run cooler, resulting in less efficient combustion?

New T-sat was put in when I replaced the water pump. The link is to the T-stat I purchased.

Murray Caps & Stats 4269 - Standard Thermostat 1997 Ford F-250 | O'Reilly Auto Parts
OldRedFord4x4 is offline  
Sponsored Links
post #2 of 3 Old 09-21-2011, 06:20 PM
Powerstroke.org Fanatic
Join Date: Jan 2008
Location: ithaca
Posts: 149
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Thanks: 0
Thanked 0 Times in 0 Posts
Feedback Score: 0 reviews
203 degrees t stat needs to be used i heard
DonF350 is offline  
post #3 of 3 Old 09-21-2011, 09:23 PM
Serving Our Country!
JSchuricht's Avatar
Join Date: Aug 2007
Location: Manor, TX
Posts: 2,961
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Thanks: 0
Thanked 23 Times in 22 Posts
Feedback Score: 2 reviews
No point in the 203 unless you want more heat or like hearing the fan run.

It sounds like you might have a bad t-stat. Pull it out and hit it with a heat gun or pan of hot water to see if it moves. My guess is it's stuck open. Also, the factory gauge is just a fancy idiot light. It has a few positions that correspond to a range of temperatures.

JSchuricht 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