Horrible fuel mileage - Ford Powerstroke Diesel Forum
Powerstroke.org is the premier Diesel Truck Forum on the internet. Registered Users do not see the above ads.
Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 07-12-2012, 04:35 PM
Compression Ignition Addict
 

Join Date: May 2011
Location: Pensacola, Florida
Posts: 354
Thanks: 0
Thanked 1 Time in 1 Post
Feedback Score: 0 reviews
Horrible fuel mileage

Does anyone know what would cause my fuel mileage to drop by about 3 MPG. The last 3 weeks i have been driving really easy so i can save some money and it seems like its backfired. Im getting around 8 miles per gallon now. The ford dealer installed a brand new ficm so i dont think thats the problem. It doesnt make any sense. Checked the air filter and it seems to be clean so if anyone knows what could cause this, please let me know.
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2  
Old 07-12-2012, 04:39 PM
Compression Ignition Addict
 

Join Date: May 2011
Location: Salt Lake City
Posts: 448
Thanks: 0
Thanked 0 Times in 0 Posts
Feedback Score: 0 reviews
6.0s dont like to be driven "easy", that could be your problem, do you have any boost leaks?
Reply With Quote Quick reply to this message
  #3  
Old 07-12-2012, 04:55 PM
Compression Ignition Addict
 

Join Date: Jul 2011
Location: springfield,il
Posts: 238
Thanks: 0
Thanked 0 Times in 0 Posts
Feedback Score: 1 reviews
what is your maintenance like. fuel filter, oil change,etc. how does the truck drive performance wise? does it pull like it should or does it feel slow.
everything like to be driven easy just make sure you open it up once in a while to keep the turbo vains free.
mike
Reply With Quote Quick reply to this message
  #4  
Old 07-12-2012, 05:09 PM
Member
 

Join Date: Oct 2010
Posts: 87
Thanks: 0
Thanked 1 Time in 1 Post
Feedback Score: 0 reviews
Possible answer

Quote:
Originally Posted by Daxman View Post
The ford dealer installed a brand new ficm so i dont think thats the problem. It doesnt make any sense.
Most likely the dealership may have reflashed your ECM/TCM to the latest strategy when they installed the new FICM and never told you about it. This happens all the time from what I have read. This generally causes a loss of 2-5 mpg most people say.
Reply With Quote Quick reply to this message
  #5  
Old 07-12-2012, 05:15 PM
Compression Ignition Addict
 

Join Date: May 2011
Location: Pensacola, Florida
Posts: 354
Thanks: 0
Thanked 1 Time in 1 Post
Feedback Score: 0 reviews
The truck drives great, i dont hear any weird noises or anything. As far as maintenace schedule, i change the oil every 5000 miles and the fuel filter every other oil change. I actually have about 10,000 miles on this set of fuel filters but thought that was fine because the truck does run fine. I open it up at least 2 times a week. I also add the ford cetane booster everytime i get fuel. I havent checked for any boost leaks yet. I odnt know, i will fill it up and calculate the mileage again. I know of all the horror stories with these motors so i the maintenace is always done.
Reply With Quote Quick reply to this message
  #6  
Old 07-12-2012, 05:17 PM
Premium Member
 

Join Date: Mar 2008
Posts: 238
Thanks: 0
Thanked 0 Times in 0 Posts
Feedback Score: 0 reviews
Quote:
Originally Posted by MO05SD View Post
Most likely the dealership may have reflashed your ECM/TCM to the latest strategy when they installed the new FICM and never told you about it. This happens all the time from what I have read. This generally causes a loss of 2-5 mpg most people say.
Yep. I lost MPG's and power/torque, but at least the turbo lag got a little longer!!
Reply With Quote Quick reply to this message
  #7  
Old 07-12-2012, 05:17 PM
Compression Ignition Addict
 

Join Date: May 2011
Location: Pensacola, Florida
Posts: 354
Thanks: 0
Thanked 1 Time in 1 Post
Feedback Score: 0 reviews
How can i check the ficm update, should i take it back to the dealer and have them flash it again.
Reply With Quote Quick reply to this message
  #8  
Old 07-12-2012, 05:42 PM
Member
 

Join Date: Oct 2010
Posts: 87
Thanks: 0
Thanked 1 Time in 1 Post
Feedback Score: 0 reviews
If you know anyone in your area with a programmer-EDGE,SCT or others. They can read the strategy you are running. The dealership can tell you also. Don't know what they would charge, but I wouldn't want most dealerships to check mine. Spent to much money going to earlier strategies and wouldn't want to lose them. Truck run 200% better and mileage has gone up 2-3 mpg from when I originally bought it.

Can't say 100% that it is why your mileage has gone down. Just have read a lot of post where trucks have gone to dealership for minor repairs or maintenance and owners say they lost 2-3 mpg. Confronted dealership and they admitted to re-flashing truck while there without owners consent.

Beings they were installing a new FICM. They had to flash it and probably re-flashed ECM/TCM to match with latest flashes.

It's just my .02 as to what may have happened.
Reply With Quote Quick reply to this message
  #9  
Old 07-12-2012, 05:45 PM
Compression Ignition Addict
 

Join Date: Sep 2010
Location: Topeka
Posts: 737
Thanks: 0
Thanked 0 Times in 0 Posts
Feedback Score: 0 reviews
If you have a SCT or a friend does hook it up and check what the FICM strategy is if not contact for ask them what strategy they put on the FICM. I would then contact PHP or IDP about having the FICM rolled back to a better strategy bring your MPG back up and more power. Also custom tunes will also help with MPG



EDIT: beat me to it
Reply With Quote Quick reply to this message
  #10  
Old 07-12-2012, 06:06 PM
Compression Ignition Addict
 

Join Date: May 2011
Location: Pensacola, Florida
Posts: 354
Thanks: 0
Thanked 1 Time in 1 Post
Feedback Score: 0 reviews
I dont have an SCT and most of my friends with trucks all drive chevy's :,... the SCT tuner is the next thing on my list. I guess i will call the dealer tomorrow to see what exactly they did.
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
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:

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
Display Modes

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



All times are GMT -8. The time now is 03:00 AM.


Powered by vBulletin® Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Search Engine Optimization by vBSEO 3.6.1
Garage Plus, Vendor Tools vBulletin Plugins by Drive Thru Online, Inc.

vB.Sponsors