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Thread: 4.0 Jeep Grand Cherokee 04

  1. #1
    Potential Tuner
    Join Date
    Aug 2020
    Posts
    3

    4.0 Jeep Grand Cherokee 04

    Anybody got tune file for 4.0 Jeep Grand Cherokee 04 running really lean

  2. #2
    Potential Tuner
    Join Date
    Jul 2019
    Posts
    7
    I've been looking around because I was thinking about what it would take to turbo a 4.0, and they have nothing for the 02-04 4.0L JGC. Must be a tough nut to crack. Or you can try your luck with a 4.7L and have all the valve seats fallout on ya at the worst time possible.

  3. #3
    Tuner in Training
    Join Date
    Oct 2020
    Posts
    11
    IM pretty sure you can not program the 4.0 jeep ecu

  4. #4
    Potential Tuner
    Join Date
    Feb 2023
    Posts
    1
    why?

  5. #5
    Tuner in Training
    Join Date
    Mar 2021
    Location
    North Carolina
    Posts
    21
    You most defiantly can tune the 4.0, both jtec and jtec+ ecu's but its needs to be a mpvi2 the new mpvi3 doesnt support jtec "yet"
    When in doubt, Throttle out