i have a 1989 jeep wagoneer limited xj 4.0 auto i can go outside in the morning and it will start up good but after you shut it off once or twice it wont start back up unless you let it set at least a couple hours i put a new cps on it today and the coil and icm arent very old either me and my dad checked the spark and its firing strong but its orange not blue and it seems to have good fuel pressure i really need some help ive been trying to fix this for almost 2 weeks

 

Also somebody has removed the ballast resistor and just wired the wires together

 

Anybody have an idea of what could be causing it

 

I'd start by searching on here for how to refresh all your grounds. I'm not entirely sure on the older XJ's like yours but on my '91, a bad ground can cause some weird electrical problems. Also, you should check your battery, cables and clamps.

 

Older, newer, all of the above. It doesn't matter if it's a Model T or an F22 fighter jet.


Bad grounds cause weird electrical problems.

 

I've already cleaned the grounds and I even added another ground from the firewall to one of the heatsheild bolts on the intake

 

I see that cruiser has found you on your second posting "89 renix 4.0 NEED HELP". If you do what he suggests, you have a great well of helpful information for 87-90 Jeeps.

 

have you checked the pcm harness?. i bought a refurbished one and it was bad right out of the box, i replaced it and no more issues, wiggle the harness around when its started and see if that stalls out the jeep. just an idea

 

Just a FYI, in a 89 jeep, there is no PCM. The factory labeled it ECM.

 

Where is the pcm harness is it under the hood or under the dash