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
    • 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

P0300 code on a 1998 Cherokee Classic with a 4.0 I6

Discussion in 'Cherokee' started by motoman122, Sep 2, 2016.

  1. Sep 2, 2016 at 7:29 PM
    #1
    motoman122

    motoman122 [OP] Member

    Joined:
    Sep 2, 2016
    Member:
    #158
    Messages:
    11
    Gender:
    Male
    First Name:
    Thomas
    Vehicle:
    1998 Cherokee Classic
    none
    My sons 4.0 is throwing a P0300 code and spitting and sputtering like crazy. After looking it up I see that it means that it is a multiple cylinder misfire which is exactly what it feels like. The first ( and cheapest ) thing I thought of was maybe a cracked distributor cap because he said it happened right after hitting a pot hole ( That has happened to me before ), but the cap seems to be okay.

    The next thing I thought was the coil. Thankfully this one doesn't have the long coil pack that the later 4.0's do, it is just the little square pack with the one coil wire coming off of it. It is cheap enough to replace, but I don't want to just start throwing parts at it either you know?

    It's also throwing a transmission code that it has never thrown before, so I am assuming it has to do with the P0300 code and the engine not building enough pressure for the tranny.

    So, I'm throwing this out there to the Jeep Guru's, what do you guys think?

    Thanks in advance!
    Thomas
     
  2. Sep 2, 2016 at 8:48 PM
    #2
    C2T

    C2T Well-Known Member

    Joined:
    Jul 31, 2016
    Member:
    #42
    Messages:
    759
    Gender:
    Male
    First Name:
    Richard
    Helena, Montana
    Vehicle:
    Jeep
    2.5" AEV Dual Sport lift, 35" Treadwright Guard Dogs, Black Rock Wheels, AEV Front & Rear Bumpers with Tire Carrier, Fuel Caddy 10 gal. Aux. fuel tank, Warn 9.5ti, 125' synthetic winch line, front axle skid, 20" LED light bar , Bilstein Shocks, steel steering skidplate,
  3. Sep 3, 2016 at 8:15 AM
    #3
    motoman122

    motoman122 [OP] Member

    Joined:
    Sep 2, 2016
    Member:
    #158
    Messages:
    11
    Gender:
    Male
    First Name:
    Thomas
    Vehicle:
    1998 Cherokee Classic
    none
    Thanks for the link to the video. The guy in the video is great! He gets right to the point and doesn't mess around like a lot of the other guys.

    We did new plugs, wires and battery when we did the top end rebuild, but I pulled the cap and the tips are grooved, so I'm going to replace the cap and rotor.

    A local Jeep Guru came by and looked at it and he said he had a guy that had the exact same thing happen to his Jeep and it was his throttle positioning sensor. That makes a lot of sense too being an electrical piece since we all know how electrical pieces are and it started after he hit a pot hole.

    I'll pick them all up and replace the cap and rotor first, if it is still doing it, I'll go ahead and put the sensor in. if that doesn't fix it. I'll know it isn't the sensor and take that $50.00 part back! LOL


    Thanks a lot!!
     

Products Discussed in

To Top