Help me troubleshoot P0306 2006 5.7 Hemi - Jeep Commander Forums: Jeep Commander Forum
General Commander Discussion General Discussion involving the Jeep Commander goes here. If it does not fit into a more specific category below, post it here.

 
LinkBack Thread Tools Display Modes
post #1 of 5 (permalink) Old 12-12-2014, 02:17 PM Thread Starter
Junior Member
Points: 2,838, Level: 32 Points: 2,838, Level: 32 Points: 2,838, Level: 32
Level up: 59% Level up: 59% Level up: 59%
Activity: 0% Activity: 0% Activity: 0%
 
Join Date: Aug 2011
Posts: 6
Help me troubleshoot P0306 2006 5.7 Hemi

Hoping you all may be able to help. I have a 2006 Commander with the 5.7 Hemi, about 100K miles. Never had any issues. Drove it up to MA from VA for Thanksgiving with no problems. The day we got back I we took it out and it was immediately idling rough. About 1 mile from home it started pinging and surging and got the CEL light. Limped it home, put me scanner on it and got the P0306 code for cylinder 6 misfire.

First action was to replace all the injectors and plugs. No indications of a problem on the #6 plugs. After everything was replaced, I took her for a drive and all went smooth with no issues and no CEL and nothing coming up on the scanner. Well Murphy's law came into play. My wife just called me and said it's doing the same thing (first time it's been driven since I did the repair). Same symptoms but no CEL. She said it won't let you rev above 2000 and it's stumbling and acting just like it did before.

My next inclination would be to swap out the coil packs, but I am reading that some folks have had that code show up for a broken valve spring or bent pushrod. What would you guys be doing next??
Rust Buster is offline  
Sponsored Links
Advertisement
 
post #2 of 5 (permalink) Old 12-12-2014, 03:56 PM
Senior Member
Points: 2,779, Level: 32 Points: 2,779, Level: 32 Points: 2,779, Level: 32
Level up: 20% Level up: 20% Level up: 20%
Activity: 0% Activity: 0% Activity: 0%
 
ARJeeper's Avatar
 
Join Date: Oct 2014
Location: Bella Vista, AR
Posts: 167
I'd frankly have a Jeep tech take a look at it. Use the deeper scan tool.

Even if you're in $90 for a diagnostic fee you might still be better off than throwing parts at it without a pinpoint problem.

The plugs were probably a good replacement anyway.
ARJeeper is offline  
post #3 of 5 (permalink) Old 12-12-2014, 04:03 PM
Senior Member
Points: 7,991, Level: 60 Points: 7,991, Level: 60 Points: 7,991, Level: 60
Level up: 21% Level up: 21% Level up: 21%
Activity: 0% Activity: 0% Activity: 0%
 
luckyse7ens's Avatar
 
Join Date: Apr 2014
Location: CA
Own a Commander?: Yes
Model year: 2010
Trim Package: Sport
Power-Train: 3.7L V-6
2WD
If 4WD - system: QT-I
Current Mileage: 140000
Posts: 1,585
Swap the coil packs and see if the issue follows the pack. (ie swap #6 and #5 coil)
luckyse7ens is offline  
 
post #4 of 5 (permalink) Old 12-12-2014, 08:44 PM
Senior Member
Points: 15,906, Level: 81 Points: 15,906, Level: 81 Points: 15,906, Level: 81
Level up: 12% Level up: 12% Level up: 12%
Activity: 0% Activity: 0% Activity: 0%
 
Mongo's Avatar
 
Join Date: Oct 2010
Location: Lusby, MD
Posts: 3,037
Swapping coil packs is a very good suggestion.

You've changed out all the Fuel Injectors? Yes, new plugs definitely.

As well, you need to clean the connectors for the coils, the coil packs themselves and inspect the boots, if you have ignition cables from the coils to other plugs, I'd consider replacing them, they do NOT last the life of the vehicle.

Water or Dirt in the connectors to the coil pack can cause misfires, carbon tracking on the coil pack can cause shorting and misfires, bad boots or ignition cables the same.

Spraying electric cleaner or even brake cleaner, electric is better, into the connector and plug part of the coil. Scrub down the coil as well with the electric cleaner. I put dielectric grease on the connector to the coil packs as well the boots, it helps keep out the dirt and water and prevent the misfires.
Mongo is offline  
post #5 of 5 (permalink) Old 07-30-2017, 10:39 AM
Senior Member
Points: 5,042, Level: 45 Points: 5,042, Level: 45 Points: 5,042, Level: 45
Level up: 46% Level up: 46% Level up: 46%
Activity: 0% Activity: 0% Activity: 0%
 
Join Date: Mar 2014
Location: NorthAmerica
Own a Commander?: Yes
Model year: 2008
Trim Package: Overland
Power-Train: 5.7L V-8 Hemi
4WD
If 4WD - system: QD-II
Current Mileage: 150000
Posts: 224
Missfire

Quote:
Originally Posted by Rust Buster View Post
Hoping you all may be able to help. I have a 2006 Commander with the 5.7 Hemi, about 100K miles. Never had any issues. Drove it up to MA from VA for Thanksgiving with no problems. The day we got back I we took it out and it was immediately idling rough. About 1 mile from home it started pinging and surging and got the CEL light. Limped it home, put me scanner on it and got the P0306 code for cylinder 6 misfire.

First action was to replace all the injectors and plugs. No indications of a problem on the #6 plugs. After everything was replaced, I took her for a drive and all went smooth with no issues and no CEL and nothing coming up on the scanner. Well Murphy's law came into play. My wife just called me and said it's doing the same thing (first time it's been driven since I did the repair). Same symptoms but no CEL. She said it won't let you rev above 2000 and it's stumbling and acting just like it did before.

My next inclination would be to swap out the coil packs, but I am reading that some folks have had that code show up for a broken valve spring or bent pushrod. What would you guys be doing next??
And your fix was ?

08, Commander, Overland, 5.7L HEMI, QD-II, Stock.
vjsimone is offline  
Sponsored Links
Advertisement
 
Reply

  Jeep Commander Forums: Jeep Commander Forum > Jeep Commander Discussion > General Commander Discussion

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Jeep Commander Forums: Jeep Commander 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











Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
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