#3 misfire, injector change no help - Ford Powerstroke Diesel Forum
6.4L Problems Forum Having Trouble? Post here

LinkBack Thread Tools Display Modes
post #1 of 2 Old 02-03-2011, 08:31 AM Thread Starter
clys's Avatar
Join Date: May 2009
Posts: 51
Thanks: 0
Thanked 0 Times in 0 Posts
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
Feedback Score: 0 reviews
#3 misfire, injector change no help

Hey guys, I've got an '08 here with a P0303 #3 misfire and contribution for the same hole. It runs smooth when first fired up and while driving, but after you get it warm and put it in park (still running) it starts to buck and cyl.3 is dropping right off on the power balance. I changed the injector and still nothing, #3 shows an 8% deviance on the relative compression test and there is a lot of blow by. I know that cyl.3 IS low on compression but why does it run so smooth when cold then drop off when warm? Is the ECU seeing that it has low contribution and cutting the injector to prevent more damage? This one is confusing me, any help would be appreciated.

Last edited by clys; 02-10-2011 at 05:39 PM.
clys is offline  
Sponsored Links
post #2 of 2 Old 02-12-2011, 09:00 AM
Powerstroke Techie

Join Date: Nov 2010
Location: South Fayette/Pittsburgh PA
Posts: 5,825
Thanks: 33
Thanked 143 Times in 129 Posts
Mentioned: 0 Post(s)
Quoted: 17 Post(s)
Feedback Score: 4 reviews
what do your short fuel trims look like on that hole? that should give you some indictation of what the pcm is doing to compensate


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

2015 F-250 XLT 6.7L

2006 F-250 6.0L SOLD
sinner6.0L is offline  
Sponsored Links

Quick Reply

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:
Please enter a password for your user account. Note that passwords are case-sensitive.


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:


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