2008 6.4l rough idle & P0305 code - Ford Powerstroke Diesel Forum

 
LinkBack Thread Tools Display Modes
post #1 of 4 Old 03-24-2014, 02:41 PM Thread Starter
Powerstroke.org Rookie
 
Join Date: Sep 2008
Posts: 6
Thanks: 0
Thanked 0 Times in 0 Posts
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
Feedback Score: 0 reviews
2008 6.4l rough idle & P0305 code

My 08 6.4l F250 is idling rough, especially in gear with foot on brake. Accelerates fine, no stumbling or hesitation and no lack of power I can notice.

I replaced the EGR valve, fuel/oil filters (OEM), oil, etc...Added some diesel Kleen to the fuel and some Rev-X to the oil.

Cleared the previous code (P0300, multiple/random cylinder misfire) and drove it about 40 miles before code set with P0305, Cylinder #5 misfire.

Coolant level hasn't budged and no other symptoms except the rough idle...which gets rougher if I idle more than a minute or so.


2008 Ford F250 6.4l diesel, 150k miles
james9876 is offline  
post #2 of 4 Old 03-24-2014, 06:01 PM
Member
 
Denny diesel's Avatar
 
Join Date: Feb 2014
Location: Mebane
Posts: 42
Thanks: 4
Thanked 1 Time in 1 Post
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
Feedback Score: 0 reviews
I was having a rough idle issue for a week or so and could not figure out why. The only thing I had done recently was run diesel Kleen gray bottle instead of the ford brand cetane boost. So I stopped using diesel clean and went back to the ford stuff and problem solved. Don't know if this is your issue but might be worth a shot. Just give it a few days without adding diesel Kleen I know some guys like the stuff but my girl did not like it at all lol
Denny diesel is offline  
post #3 of 4 Old 03-31-2014, 09:06 PM Thread Starter
Powerstroke.org Rookie
 
Join Date: Sep 2008
Posts: 6
Thanks: 0
Thanked 0 Times in 0 Posts
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
Feedback Score: 0 reviews
Dealer says I have 3 bad injectors: 5, 6 & 8. I've ordered new injectors and have the passenger valve cover off and #5 injector out (see pic). Two of the little plastic rocker clips are broken (cylinders 1 & 3 exhaust valve rocker). I've been searching for the part number or a source for replacements with no luck yet. Do these actually serve any purpose? I hear of broken lifters being blamed on these clips failing, but for the life of me I cannot see how these little dinky pieces of plastic could have an impact of the rocker operation. Is it more likely that when a rocker arm fails, it takes out the plastic clip with it and then the clip is blamed??
james9876 is offline  
post #4 of 4 Old 04-01-2014, 06:33 AM
Compression Ignition Addict
 
04hdfatboy's Avatar
 
Join Date: Oct 2010
Posts: 4,614
Thanks: 16
Thanked 95 Times in 93 Posts
Mentioned: 0 Post(s)
Quoted: 4 Post(s)
Feedback Score: 0 reviews
You can buy the whole rocker assembly for about $150. That is what I would do while you have the valve covers off. Part number is 8C3Z-6564-D. It comes with all the rockers for one side and new clips.

08 F350 cc/sb 4X4
h&s minimaxx, 5" flo pro, 4" down pipe, no limit cold air intake, dirty diesel EGR delete with intake elbow, 6.0 exhaust manifolds, custom up pipes, ported intake manifold, Apex 71mm LP turbo, Rudy's cold side pipe, diesel site coolant and transmission filter, diesel site intercooler boots, ccv mod, bilstein shocks, gogo dd solenoid, HID lights, Airdog II 165, PMF traction bars, PMF drag link, moshimoto aluminum radiator
04hdfatboy is offline  
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