Originally Posted by Alfons
The distributor needs to be set up properly, then the ECU handles the rest of the timing, but the initial setup is very important. In my opinion, the easiest thing to do at this point would be to pull the distributor out and to set it up properly, then at least, you've got a fighting chance of getting the engine to run right. Here are the pertinent two pages from the factory service manual that describe how to set up the 4 liter distributor. You need to pay attention to where the rotor needs to be when the engine is rotated to TDC, so the "scribe mark" described on the first page is very important.
I'd also recommend that you invest in some type of manual to give you a hand in understanding and maintaining your jeep. The Haynes manual is normally the easiest and cheapest to get - the stuff in my pics is also described in the Haynes manual.
That works for an un
disturbed distributer or an engine that has not been disturbed.
First off check your timing with a timing light.
If you don't have one then here's anothe way of checking engine timing out:
Pull all your plugs so the motor can be turned by hand easier. Using a large socket and breaker bar turn the motor over until while your finger is in #1 spark plug hole. Get a friend to help you. As the engine comes up on TDC of the compression stroke
you will feel pressure on your finger (compression!)
Now at the top
of that stroke your engine will be at TDC on the compression stroke. If your TDC mark is not aligned with the pointer then the timing chain set is messed up somewhow and your pointer is now pointing at the new TDC mark on your harmonic balancer wherever that might be. Mark it well so you can find it later on.
Now mark the dizzy body where the #1 spark plug tower is on the dist. cap. Now remove the cap. The rotor should be about to go by the mark you made on the body of the dist( #1 sprak plugtower on the cap). If it isn't then your dist. is probably in wrong.
If you have determind that the dist is in wrong:
Now you have to pull the dist. with the rotor inmplace and get the rotor aligned just before that mark on the dist body you made earlier ANd you have to get the dist shaft aligned with the slot on the oil pump to drive it AND you have to deal with the curved gdrive gear on the cam shaft that will not allow you to just drop the dist in the engine it has to be 'backed off' some. If any of this does not make sense to you get help. I hope I didn't scare you off or anything but if you can not visualize what these moving parts are doing relative to each other, then I would get help. Lot od luck on your project!