05 GC 4.7 Cylinder #5 Misfire - JeepForum.com
LinkBack Thread Tools
post #1 of 4 Old 08-12-2013, 11:07 AM Thread Starter
Registered User
2005 WK 
Join Date: Jul 2012
Location: alexandria
Posts: 15
05 GC 4.7 Cylinder #5 Misfire

This might be long winded... This is an 05 GC with a 4.7 and 88k miles

Two thousand miles ago I had the local shop change out the spark plugs as part of the 90K mile service. A few weeks ago the CEL came on and I brought it back into the shop because it was popping codes 300 and 305 for cylinder #5 misfire. They changed out the spark plugs after I asked them with the OEM recommended copper core plugs. In addition they changed out the coil for the number 5 cylinder, all at their cost. Needless to say the CEL came back on.

The car now sits at the stealership because it is under warranty. They just called and said that the #5 cylinder failed the pressure check. Service rep states that the pressure is 90 psi. They had not got into the engine to see what is causing the pressure loss.

I have searched the forums and have not really seen what the most common cause is for this issue. I did see a few posts that said something about carbon build up on the valves.

What do you guys think? I am worried that the warranty will not cover it. You know how they operate.

pjtownsend76 is offline  
Sponsored Links
post #2 of 4 Old 08-12-2013, 09:45 PM
Registered User
Join Date: Aug 2013
Posts: 18
Typical issue with those are in the heads. Usually bad head gasket or possibly cracked head. One question I have is was it a constant dead miss or was it random. The 4.7 also was know for dropping rockers. Back when I worked for jeep wasnt uncommon at least once a month to have to replace a rocker or two.
sammccorison is offline  
post #3 of 4 Old 08-14-2013, 06:01 AM
Registered User
2007 WK 
Join Date: Jan 2005
Location: Baltimore
Posts: 4,688
its under warranty

2007.5 WK Laredo 4.7
paroxysym is offline  
post #4 of 4 Old 08-16-2013, 06:30 AM Thread Starter
Registered User
2005 WK 
Join Date: Jul 2012
Location: alexandria
Posts: 15
#5 cylinder exhaust valve was "bad" according to the message the dealership left. The warranty company is sending someone out to evaluate it. They have already asked for my maintenance records for the past year. Thanks for the advice guys. I'll let you know how bad the warranty company beats me up.
pjtownsend76 is offline  

4.7 , misfire cyl , wk

Quick Reply

Register Now

In order to be able to post messages on the JeepForum.com 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 e-mail 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.

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

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 Off
Pingbacks are On
Refbacks are On

For the best viewing experience please update your browser to Google Chrome