Need a little info please!! - Ford Powerstroke Diesel Forum

7.3L IDI (Non-Powerstroke) Diesels Technical discussion of topics related to vehicles powered by the 7.3 Liter In-Direct Injection Navistar engines.

 
LinkBack Thread Tools Display Modes
post #1 of 5 Old 01-12-2011, 09:03 AM Thread Starter
Powerstroke.org Rookie
 
ccoyle's Avatar
 
Join Date: Jan 2011
Location: Harrisville, Pa
Posts: 11
Thanks: 0
Thanked 0 Times in 0 Posts
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
Feedback Score: 0 reviews
Need a little info please!!

I signed up on the forum a short time ago. This is my first diesel, and I have already done a few things to her. Replaced a few glow plugs and the glow plug relay. My next endeavor is to replace the clutch fan. Don't know what happened to it, but i can see a few ball bearings sticking out. I'm thinking it was like this when we bought it.

My biggest concern though is the fuel mileage. I am only averaging 10-12 MPG with it. Is this normal for a lifted truck and what should I check otherwise?? I have also noticed that when you are driving down the highway that the truck seems to let loose. It only does it for a second. It seems like the turbo spools and then drops off. I have never seen the turbo go above 10psi. At cruising speeds it stays steady at 5-8....I know that IDI's can be tempermental and if I could have had my choice I would have had a Powerstroke... I traded a motorcycle for it and the wife loves it and drives it more than I do. She has had one before.....

I guess what I need to know is what do i start looking for and did I get myself in over my head?? Any input would be wonderful guys...


1994 F250 IDI Turbo Diesel...
Solid front axle, 5spd conversion, 6" ProComp lift, 37's
1999 Eddie Bauer Expedition.....
Family truckster...
2002 Mineral Gray Mustang Gt....
Many mods....Weekend Warrior!!

Chris is the name!!
ccoyle is offline  
post #2 of 5 Old 01-12-2011, 04:50 PM
Powerstroke.org Rookie
 
TurboDiesel94's Avatar
 
Join Date: Oct 2010
Location: Gettysburg, PA
Posts: 9
Thanks: 0
Thanked 0 Times in 0 Posts
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
Feedback Score: 0 reviews
With 37's I could definitely see them affecting your mileage. What are your axles geared to? 10psi is fine, somebody has adjusted the wastegate to achieve that. If the injection pump has been turned up that can also take your mileage down. How many miles on the truck, and pump?

1994 F250 7.3IDIT XLT 4X4 E4OD 183K
Pump Turned Up 2 Flats, Advanced Timing, DIY Intake, Straight Pipe into 5" Turnout Stack
Guages: Pyro, Boost, Trans, Water, Oil
TurboDiesel94 is offline  
post #3 of 5 Old 01-13-2011, 06:29 AM Thread Starter
Powerstroke.org Rookie
 
ccoyle's Avatar
 
Join Date: Jan 2011
Location: Harrisville, Pa
Posts: 11
Thanks: 0
Thanked 0 Times in 0 Posts
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
Feedback Score: 0 reviews
Quote:
Originally Posted by TurboDiesel94 View Post
With 37's I could definitely see them affecting your mileage. What are your axles geared to? 10psi is fine, somebody has adjusted the wastegate to achieve that. If the injection pump has been turned up that can also take your mileage down. How many miles on the truck, and pump?
I'm not real sure what it is geared at. I know that it is about 8mph slower than what I am actually going. The truck has 205k on it as well as the pump I believe. The trans was a 5spd swap and the front axle was swapped for a solid front as well. At highway speeds in 5th gear it cruises between 18-2k rpm. Thats at what the speedo says is around 55-60 mph tho. The only way to really tell what it is I guess is use a GPS to see...


1994 F250 IDI Turbo Diesel...
Solid front axle, 5spd conversion, 6" ProComp lift, 37's
1999 Eddie Bauer Expedition.....
Family truckster...
2002 Mineral Gray Mustang Gt....
Many mods....Weekend Warrior!!

Chris is the name!!
ccoyle is offline  
post #4 of 5 Old 01-16-2011, 06:17 AM Thread Starter
Powerstroke.org Rookie
 
ccoyle's Avatar
 
Join Date: Jan 2011
Location: Harrisville, Pa
Posts: 11
Thanks: 0
Thanked 0 Times in 0 Posts
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
Feedback Score: 0 reviews
TTT....No one else has anything that they can ad???


1994 F250 IDI Turbo Diesel...
Solid front axle, 5spd conversion, 6" ProComp lift, 37's
1999 Eddie Bauer Expedition.....
Family truckster...
2002 Mineral Gray Mustang Gt....
Many mods....Weekend Warrior!!

Chris is the name!!
ccoyle is offline  
post #5 of 5 Old 01-16-2011, 12:28 PM
Powerstroke.org Rookie
 
TurboDiesel94's Avatar
 
Join Date: Oct 2010
Location: Gettysburg, PA
Posts: 9
Thanks: 0
Thanked 0 Times in 0 Posts
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
Feedback Score: 0 reviews
If thats the original IP then its probably time for a rebuild soon, but it doesn't seem like its giving you problems yet. You also mentioned the fan clutch, if that is not working and is running locked up that can also take your mpg down a bit too. Axle gearing can be found on a tag on the rear axle or on the sticker inside the driver side door jamb using the axle code and google.

1994 F250 7.3IDIT XLT 4X4 E4OD 183K
Pump Turned Up 2 Flats, Advanced Timing, DIY Intake, Straight Pipe into 5" Turnout Stack
Guages: Pyro, Boost, Trans, Water, Oil
TurboDiesel94 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