failing #8 contribution - 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 11-23-2008, 06:41 PM
Powerstroke.org Rookie
 

Join Date: Aug 2007
Posts: 7
Thanks: 0
Thanked 0 Times in 0 Posts
Feedback Score: 0 reviews
failing #8 contribution

this a new 7.3 engine. compression test is fine in the cylinder. cylinder velocity shows 2.9-4.6 but the engine idles smoothe and no skips. I repalced the injector with another from ford and the cackle is down very much now but it still fails the contribution test. I still have hight readings in the cylinder velocity test. What gives?
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2  
Old 11-23-2008, 07:16 PM
Cynic
 

Join Date: Jun 2007
Location: Fort Worth, Texas
Posts: 11,179
Thanks: 0
Thanked 3 Times in 2 Posts
Feedback Score: 0 reviews
How many miles have been put on the engine since the injector was replaced?


Although, I've seen number 8 failure for no good reason. Make sure the engine is hot. Run multiple tests. Try putting the drive in drive with the emergency brake on. This will put load on the motor.
Reply With Quote Quick reply to this message
  #3  
Old 11-23-2008, 07:27 PM
Powerstroke.org Rookie
 

Join Date: Aug 2007
Posts: 7
Thanks: 0
Thanked 0 Times in 0 Posts
Feedback Score: 0 reviews
i have put 300 miles so far since the injector change. Is it normal for the #8 injector to read this high of a percentage? i did the test again and it passed with the parking brake on in drive. Is it possible that the ford injector is faulty? It is a reman from them
Reply With Quote Quick reply to this message
  #4  
Old 11-23-2008, 07:46 PM
Compression Ignition Addict
 

Join Date: Dec 2007
Location: Flint, MI
Posts: 4,057
Thanks: 0
Thanked 0 Times in 0 Posts
Feedback Score: 0 reviews
My #8 was failing and I replaced it with a reman. Still fails the contribution test but it isn't shaking as much and not barely knocking at all.
Reply With Quote Quick reply to this message
  #5  
Old 11-23-2008, 08:00 PM
Electrical Ogre
 

Join Date: Aug 2007
Location: Calgary, Alberta
Posts: 11,655
Thanks: 29
Thanked 54 Times in 51 Posts
Feedback Score: 1 reviews
What year is the truck? Depending on Calibration, #8 may need the infamous "long lead" injector. If there is a "cackle cure" calibration in the PCM, and a regular injector in #8, contribution will be off.
Reply With Quote Quick reply to this message
  #6  
Old 11-23-2008, 08:51 PM
Powerstroke.org Rookie
 

Join Date: Aug 2007
Posts: 7
Thanks: 0
Thanked 0 Times in 0 Posts
Feedback Score: 0 reviews
#8 has the long lead injector with the pmt1 computer
Reply With Quote Quick reply to this message
  #7  
Old 11-23-2008, 08:55 PM
Cynic
 

Join Date: Jun 2007
Location: Fort Worth, Texas
Posts: 11,179
Thanks: 0
Thanked 3 Times in 2 Posts
Feedback Score: 0 reviews
Seriously, engine runs smooth. No skips. Passes with load. Like I said before, some trucks will fail number 8 just to fail.


Stop looking for things to do or install a regulated return that will stop number 8 from starving for fuel.
Reply With Quote Quick reply to this message
  #8  
Old 11-23-2008, 09:04 PM
Powerstroke.org Rookie
 

Join Date: Aug 2007
Posts: 7
Thanks: 0
Thanked 0 Times in 0 Posts
Feedback Score: 0 reviews
LOL looks like you guys have led me in a good direction. I does seem that #8 will always be the lone wolf and will continue have a higher percentage . I can live with the slight knocking cackle. well at least its very low now since i changed the injector. Learning more each time i get on the forum
Reply With Quote Quick reply to this message
  #9  
Old 11-23-2008, 09:06 PM
Cynic
 

Join Date: Jun 2007
Location: Fort Worth, Texas
Posts: 11,179
Thanks: 0
Thanked 3 Times in 2 Posts
Feedback Score: 0 reviews
In all honesty, it's a dead head fuel system. Number 8 fires directly after number 6. the LL injector is a just a quick band aid fix. Invest in a regulated return.
Reply With Quote Quick reply to this message
  #10  
Old 11-23-2008, 09:26 PM
Powerstroke.org Rookie
 

Join Date: Aug 2007
Posts: 7
Thanks: 0
Thanked 0 Times in 0 Posts
Feedback Score: 0 reviews
Dirk. Which regulated return do you advise to use?
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 03:11 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