So if I disconnect the vacuum line closest to the front of the jeep on the intake manifold, the idle picks up to about 1100 and the jeep runs fine

 

Also, while it was idling really rough, I disconnected the MAP sensor and the idle smoothed right out for about 10 seconds, then, it died.

 

A little update: Even though my cap and rotor were fairly new, I went and bought a brand new set yesterday since they are cheap. The jeep ran great on my way to work this morning! I've only driven it just this one time since but, who knows, maybe that cap and rotor were bad and they just didn't look like it?

 

I don't know if this is the case but is the coolant temp sensor still good? I heard that it could affect the engine to run like that.

 

I take it that you resolved the 0.00 volts at the crank sensor connector....

 

Yeah, coolant temp sensor is good. I thought the same thing at first

 

If I disconnect the plug, I get the correct voltage but, when I back probe it, I still get zero. I'm going to assume my meter isn't getting good contact, even though it has worked fine for all the other sensors

 

If you tried using a paperclip as a back probe that rarely works.


I use a small safety pin (#1 in the pic) to back probe.

 

I used the old paperclip method so that may be my problem.

 

My instructions in post #25 said to unplug the crank sensor and take the reading at the connector pin cavity, not to back probe it.


All that $h!t for nothing.

 

I tried that and got resistance and no voltage. That's why I back probed it, I thought it might make a difference (it didnt)