1. Welcome to Jeeps.net!

    You are currently viewing as a guest! To get full-access, you need to register for a FREE account.

    As a registered member, you’ll be able to:
    • Participate in all Jeep discussion topics
    • Transfer over your build thread from a different forum to this one
    • Communicate privately with other Jeep owners from around the world
    • Post your own photos in our Members Gallery
    • Access all special features of the site

2010 JK Misfiring

Discussion in 'Wrangler JK (2007-2017)' started by Jkboss, Aug 25, 2016.

  1. Aug 25, 2016 at 12:29 PM
    #1
    Jkboss

    #1
    Jkboss [OP] Member

    Joined:
    Aug 25, 2016
    Member:
    #123
    Messages:
    8
    Gender:
    Male
    Vehicle:
    2010 Ruby
    Just changed plugs, wires and coil. 83k miles and needed it anyway. Still misfiring. Anybody experience this? Code said #4 cylinder
     
    Jkboss, Aug 25, 2016
    #1
  2. Aug 25, 2016 at 3:51 PM
    #2
    bostonbilly

    #2
    bostonbilly Well-Known Member

    Joined:
    Jul 25, 2016
    Member:
    #12
    Messages:
    109
    Gender:
    Male
    Boston
    Vehicle:
    2015 Sahara JKU
    I would look at the fuel delivery. Has it always been number 4? Switch plugs and wires from another cylinder to to eliminate the ignition side of the equation
     
    bostonbilly, Aug 25, 2016
    #2
  3. Aug 25, 2016 at 5:04 PM
    #3
    Jkboss

    #3
    Jkboss [OP] Member

    Joined:
    Aug 25, 2016
    Member:
    #123
    Messages:
    8
    Gender:
    Male
    Vehicle:
    2010 Ruby
    Since replacing all plugs, wires and coil, my feeling is that ignition is rules out. That cylinder gets spark. You are on to something. I noticed a very strong fuel smell when it is running but no leaks that I can see.
     
    Jkboss, Aug 25, 2016
    #3
  4. Aug 25, 2016 at 5:09 PM
    #4
    bostonbilly

    #4
    bostonbilly Well-Known Member

    Joined:
    Jul 25, 2016
    Member:
    #12
    Messages:
    109
    Gender:
    Male
    Boston
    Vehicle:
    2015 Sahara JKU
    As long as you feel good about ignition, I would swap injectors between a couple of cylinders to see if the code moves. If it does replace injector, if it doesn't look into harness for that injector
     
    bostonbilly, Aug 25, 2016
    #4
  5. Aug 26, 2016 at 12:27 AM
    #5
    Jkboss

    #5
    Jkboss [OP] Member

    Joined:
    Aug 25, 2016
    Member:
    #123
    Messages:
    8
    Gender:
    Male
    Vehicle:
    2010 Ruby
    That sounds like some good advice. That will be my next move on Monday. Thanks!
     
    Jkboss, Aug 26, 2016
    #5
    bostonbilly likes this.
  6. Aug 31, 2016 at 11:12 PM
    #6
    Jkboss

    #6
    Jkboss [OP] Member

    Joined:
    Aug 25, 2016
    Member:
    #123
    Messages:
    8
    Gender:
    Male
    Vehicle:
    2010 Ruby
    So this was my issue and solution: The misfiring was as mentioned on the obd. #4 cylinder spark. I changed all plugs. Still got the #4 misfiring. Changed all wires. This is where i screwed up. Now I have random misfire including #4 cylinder. Unknowing to me, as hard as i tried not to, I crossed a wire. I next changed the coil. Still, of course, same problem. Finally I figured it out. 3 and 5 were crossed. Wheww!! The problem was the #4 wire. Headers on the jk and a couple wires thread between on the driver side. Think that caused it to wear on that wire.
     
    Jkboss, Aug 31, 2016
    #6
  7. Aug 31, 2016 at 11:16 PM
    #7
    Jkboss

    #7
    Jkboss [OP] Member

    Joined:
    Aug 25, 2016
    Member:
    #123
    Messages:
    8
    Gender:
    Male
    Vehicle:
    2010 Ruby
    The cool thing is that I was due for a tune up. At 83k miles, those spark plugs were toast! Glad I was only out of a hundred bucks!!
     
    Jkboss, Aug 31, 2016
    #7
  8. Aug 31, 2016 at 11:17 PM
    #8
    Jkboss

    #8
    Jkboss [OP] Member

    Joined:
    Aug 25, 2016
    Member:
    #123
    Messages:
    8
    Gender:
    Male
    Vehicle:
    2010 Ruby
    Thanks for advice!
     
    Jkboss, Aug 31, 2016
    #8
  9. Sep 1, 2016 at 3:39 AM
    #9
    bostonbilly

    #9
    bostonbilly Well-Known Member

    Joined:
    Jul 25, 2016
    Member:
    #12
    Messages:
    109
    Gender:
    Male
    Boston
    Vehicle:
    2015 Sahara JKU
    Glad we could help and that you got it figured out
     
    bostonbilly, Sep 1, 2016
    #9
Register FREE to Reply!
To Top