1-5-3-6-2-4
the 4.0 six in a 90 jeep Cherokee is not a v6 it is an inline 6. the firing order is 153624
its 1-5-3-6-2-4 Clockwise on the distributor, #1 is at the front of the engine.
1987 4.0liter Firing Order. Happy to help. Engine model wasn't specified and there are two possibilities for 1987. Here are both: Firing order for 1987 4.0 litre 6 cyl engines: 1 5 3 6 2 4...