8-10 mpg in 7.3 powerstroke??? Ideas of possible issues? - Ford Powerstroke Diesel Forum
Reply
 
LinkBack Thread Tools Display Modes
post #1 of 31 Old 04-17-2013, 02:46 PM Thread Starter
Powerstroke.org Rookie
 
Norcalblondy's Avatar
 
Join Date: Apr 2013
Location: Napa, ca
Posts: 8
Thanks: 0
Thanked 0 Times in 0 Posts
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
Feedback Score: 0 reviews
Cool 8-10 mpg in 7.3 powerstroke??? Ideas of possible issues?

I just bought a 2000 f350 with 275k mi,crew cab sb 4x4. Did a full tune up, changed all the fluids to synthetic, new turbo up pipes, new tranny cooler, complete 4" exhaust, dp 3 stage tuner, stock, tow haul, and economy. Compression tested all injectors and im still getting8-9 mpg. Put 6" lift with 35" tires and it increased to 10 mpg. What could e causing this? Sensor? Exhaust waste gate sticking? Looking for ideas...
Norcalblondy is offline  
Sponsored Links
Advertisement
 
post #2 of 31 Old 04-17-2013, 02:47 PM
Premium Member
 
dannanw's Avatar
 
Join Date: Mar 2010
Location: Colorado
Posts: 5,416
Thanks: 8
Thanked 72 Times in 65 Posts
Mentioned: 7 Post(s)
Quoted: 51 Post(s)
Garage
Feedback Score: 0 reviews
so you have 35in tires and 10mpg...lol that aint that bad.

What this nation needs is cleaner thoughts and dirtier fingernails...

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
dannanw is offline  
post #3 of 31 Old 04-17-2013, 03:02 PM
Super Moderator


 
SuperCrutyPS's Avatar
 
Join Date: Jul 2008
Location: Orangevale, CA
Posts: 15,579
Thanks: 88
Thanked 519 Times in 503 Posts
Mentioned: 5 Post(s)
Quoted: 289 Post(s)
Garage
Feedback Score: 0 reviews
I'm assuming it had stock wheels/tires when you got it? Something is off somewhere I get 12-13 in town, 17-18 on the highway. See my signature for the truck I drive.

Check or change the fuel filter? Intake?
You could be having an issue with the EBPV (Exhaust Back Pressure Valve). It's in the turbo base. If it is sticking shut, could be restricting exhaust flow. There is also the EBP tube up front. There's a sensor right behind the fan at the base of the HPOP. From it is a tube that runs over to the passenger side exhaust manifold. It's been said if it is plugged, it can affect mileage.
Check out this thread regarding cleaning the tube:
How to: Clean EBPS to gain lost MPGs (Video)

Just curious, what part of NorCal do you live in?


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

Owner | Operator: Darryl
My Truck Garage:
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

Tow Toy Garage :
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

United States Navy - IC2 - '76-'80
SuperCrutyPS is online now  
post #4 of 31 Old 04-17-2013, 03:39 PM
Compression Ignition Addict
 
Daxman's Avatar
 
Join Date: May 2011
Location: Pensacola, Florida
Posts: 354
Thanks: 0
Thanked 2 Times in 2 Posts
Mentioned: 0 Post(s)
Quoted: 1 Post(s)
Feedback Score: 0 reviews
I always add a little cetane booster and it gives me a extra mile or two, always makes me feel better, lol
Daxman is offline  
post #5 of 31 Old 04-17-2013, 04:13 PM
Compression Ignition Addict
 
jesilvas's Avatar
 
Join Date: Feb 2009
Location: Nacogdoches, TX
Posts: 11,148
Thanks: 0
Thanked 27 Times in 25 Posts
Mentioned: 0 Post(s)
Quoted: 1 Post(s)
Feedback Score: 0 reviews
Mile a two with extra cetane? Hmmm

Anyway, could be low fuel pressure, low ICP, worn injectors, bad MAP/BARO/EBP sensors, boost leaks. If you have a service bed, that's a lot of weight. Hwy/city driving. Accelerating hard. Blowing black smoke. Running way over 2k RPMs. Towing all the time. Just a few. You're hand calculating mileage right?


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

2000 F-350 Lariat Super Duty, Dually, CCLB, 7.3L
4R100, 2wd
330,000 + miles
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
jesilvas is offline  
post #6 of 31 Old 04-17-2013, 11:11 PM Thread Starter
Powerstroke.org Rookie
 
Norcalblondy's Avatar
 
Join Date: Apr 2013
Location: Napa, ca
Posts: 8
Thanks: 0
Thanked 0 Times in 0 Posts
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
Feedback Score: 0 reviews
Ok, has brand new fuel filter, and aftermarket air. Exhaust wastegate at turbo seems to be working. I was told if its not opening it whistles a bit. Mine is quiet. Ill have to check the tue that can clog and that sensor tomorrow. Also noticed tonight that in park and truck is running my rpm jumps a bit... Between 500-1500. This another issue? Possibly connected? And when i got the truck yes it was stock. Lift has not made milage worse. And i live in napa.
Norcalblondy is offline  
post #7 of 31 Old 04-17-2013, 11:15 PM Thread Starter
Powerstroke.org Rookie
 
Norcalblondy's Avatar
 
Join Date: Apr 2013
Location: Napa, ca
Posts: 8
Thanks: 0
Thanked 0 Times in 0 Posts
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
Feedback Score: 0 reviews
Quote:
Originally Posted by jesilvas View Post
Mile a two with extra cetane? Hmmm

Anyway, could be low fuel pressure, low ICP, worn injectors, bad MAP/BARO/EBP sensors, boost leaks. If you have a service bed, that's a lot of weight. Hwy/city driving. Accelerating hard. Blowing black smoke. Running way over 2k RPMs. Towing all the time. Just a few. You're hand calculating mileage right?
Injectors were tested and are supposedly working fine. No service bed and yes i tow but fuel milage drops to 8 towing...another thing- this truck has absolutely no black smoke . No smoke at all thats visible. Not even right when u start it. Is that odd? I also baby it when i drive.
Norcalblondy is offline  
post #8 of 31 Old 04-18-2013, 12:41 AM
Compression Ignition Addict
 
dentexpowerstroke's Avatar
 
Join Date: Sep 2011
Location: Denton, tx
Posts: 1,388
Thanks: 0
Thanked 16 Times in 13 Posts
Mentioned: 1 Post(s)
Quoted: 0 Post(s)
Feedback Score: 1 reviews
Couldn't be that it is an 8,000 truck with oversized tires and lifted with the aerodynamics of brick? Is the speedo calibrated for 35s?

Sold 2001 f250 ccsb 4x4 400/400, dual terminators, swamps 80mm bfh, headers, bts and all the usual supporting mods. 715hp fuel only.

06 f250 ccsb king ranch

12 f250 lariat ultimate
dentexpowerstroke is offline  
post #9 of 31 Old 04-18-2013, 04:32 AM
Compression Ignition Addict
 
jesilvas's Avatar
 
Join Date: Feb 2009
Location: Nacogdoches, TX
Posts: 11,148
Thanks: 0
Thanked 27 Times in 25 Posts
Mentioned: 0 Post(s)
Quoted: 1 Post(s)
Feedback Score: 0 reviews
If your RPMs jump between 500 and 1500 that's a pretty big issue.


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

2000 F-350 Lariat Super Duty, Dually, CCLB, 7.3L
4R100, 2wd
330,000 + miles
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
jesilvas is offline  
post #10 of 31 Old 04-18-2013, 06:41 AM Thread Starter
Powerstroke.org Rookie
 
Norcalblondy's Avatar
 
Join Date: Apr 2013
Location: Napa, ca
Posts: 8
Thanks: 0
Thanked 0 Times in 0 Posts
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
Feedback Score: 0 reviews
My brother had the exact same truck and got 28-32 in it with a 10 inch lift and 37's. theres a mechanical issue going on... Just need to find it. What would cause rmps to jump like that? Maybe connected to fuel issue?
Norcalblondy is offline  
Sponsored Links
Advertisement
 
Reply

Tags
7.3 , bad fuel economy , chip , lifted crew cab , powerstroke 7.3

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