02 Liberty hard to start runs rough - JeepForum.com
Sign Up   Today's Posts
User: Pass: Remember?
Advertise Here
Jeep Home Jeep Forum Jeep Classifieds Jeep Registry JeepSpace Jeep Reviews Jeep Gallery Jeep Clubs Jeep Groups Jeep Videos Jeep Events Jeep Articles
Go Back JeepForum.com > Models > Jeep Liberty Forums > KJ Liberty Forum > 02 Liberty hard to start runs rough

Introducing MONSTALINER™ UV Permanent DIY Roll On Bed LineForever Wave Flags at JeepHutRubicon Express lift kits w/shocks are on sale!

Unread 06-17-2013, 08:07 AM   #1
Registered User
Join Date: Jun 2013
Location: lexington, ky
Posts: 1
02 Liberty hard to start runs rough

Difficult to start, runs/idles rough until you reach about 55mph. Changed plugs and pulled a few codes said the #1 and #5 are misfiring, after plugs no misfire codes just no imporvement on run/idle.

if_i_only_knew is offline   Reply With Quote Quick reply to this message
Unread 06-17-2013, 06:26 PM   #2
Registered User
2005 KJ Liberty 
Join Date: Jul 2011
Location: Castle Pines, Colorado
Posts: 2,948
You put the NGK copper plugs gapped to oe spec on the emission sticker, correct? You may have suffered a coil failure, or multiple coil failure, or possibly injector issues. Either will cause your symptoms. You'll have to drive it some to re-trigger misfire codes, they won't always set in the driveway. See if the misfires are still on the same cylinders. If so, swap the coils for those cylinders to different cylinders, and note where you put them. Clear codes, drive it and see if codes return for misfires where you put the coils. Also, you need to reset the fuel trims after doing a repair like you did, otherwise it may run poorly until it finally relearns.
streetglideok is offline   Reply With Quote Quick reply to this message

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.

Thread Tools

Jeep, Wrangler, Cherokee, Grand Cherokee, and other models are copyrighted and trademarked to Jeep/Chrysler Corporation. JeepForum.com is not in any way associated with Jeep or the Chrysler Corp.