Chasing down lack of power and low mileage - Ford Powerstroke Diesel Forum
User Tag List

 
LinkBack Thread Tools Display Modes
post #1 of 2 Old 07-29-2011, 06:32 AM Thread Starter
Compression Ignition Addict
 
audiocontr's Avatar
 
Join Date: Jul 2010
Location: Falls Chruch
Posts: 463
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Thanks: 0
Thanked 0 Times in 0 Posts
Feedback Score: 0 reviews
Chasing down lack of power and low mileage

4x4 model, 125k miles, 4" turbo back, SuperChips at Hi-Perf.

I'm trying to locate a low power issue and a significant decrease in fuel mileage over the past year (11 city regardless if i stomp on it or drive like a grandma). The truck seems like it needs a significant amount of pedal to get moving and the engine cackle is much louder than seems appropriate for the acceleration. I have an AE for testing suggestions.

Front brakes do not appear as if they are hanging. Unsure on rear.

Contribution fails on number 8 due to the CPS, AE shows velocity change of 6% on 8 and 3% on 3. Very common with the CPS issues. All buzz tests and standard tests show normal results. Max boost is easily 27psi, where 50% accelerator usually hits between 10 and 14 psi.

AE graph of ICP, DC%, RPM and Boost attached. Total of 3 runs. Any ideas of what to check next?
Attached Thumbnails
Click image for larger version

Name:	3 runs.jpg
Views:	45
Size:	94.4 KB
ID:	27296  
audiocontr is offline  
Sponsored Links
Advertisement
 
post #2 of 2 Old 01-03-2012, 06:50 AM Thread Starter
Compression Ignition Addict
 
audiocontr's Avatar
 
Join Date: Jul 2010
Location: Falls Chruch
Posts: 463
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Thanks: 0
Thanked 0 Times in 0 Posts
Feedback Score: 0 reviews
A follow up for those searching - it was the FPR. AE does not check fuel pressure. YOU should.

Nonconformist. Functionality over bling.

My three rules for 7.3l troubleshooting: 1) Replace CPS and keep a spare. 2) Replace FPR and know your fuel pressure. 3) Hook it to a scanner and check for codes.
audiocontr is offline  
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:
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