1-5-3-6-2-4
ALL Jeep 4.0 motors use this firing order. Any year, any model, high output or not.
Also, the spark plug wire placement on the cap, in a clockwise direction from the post nearest the engine block is: 6-2-4-1-5-3.
(to the left side of the number 6 post, there should be a hold down
screw or strap for fastening the distributor cap to the distributor.
For a picture diagram, please go to this website:
http://www.jeepz.com/forum/engine/16923-six-cylinder-4-0-liter-jeep-engine-specs.html
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