I'm having some troubles with my jeep. I have replaced the ignition coil, spark plugs and wires, O2 sensor, cps, rotor and distributor cap, and fuel pump and filter. The trouble code that I get is 12 which leads me to the pcm/ecm. Would there be any other types of problems in the ignition system that would prevent spark?

 

try the cam sensor, i think its called on this year the ignition coil pickup or something like that.

its located under the distributor cap, think cost around 15-30 bucks. i had a problem where my jeep would crank but not start, replaced things and tested things one by one, odd though in my case i'd replace something and it would run great for a day then back to not starting. you've already replaced more than i did except for that part, since i replaced that part i've not had a problem since.

 

Wow, an Inline V6!!!! Cool!

 

I did replace that, forgot to put it in there. It didn't really solve my problem, but it was bad anyway so it was good to replace it sooner than later.