I usually don't like to make a new thread on a topic thats been covered so many times but i've tried replacing about everything at this point and need some outside opinions. Alright here's the rundown. I've got a 98 jeep cherokee 4.0 with distributor and coil style ignition. I drove it to a buddies house two days ago. Yesterday I go outside to start it up and it just keeps cranking. Doesn't sound like it wants to turn over at all. We've got fuel pressure we just don't have spark. We tested the wires and we're getting power all the way to the ignition coil it's just not telling the plugs to fire for some reason. My uncle came and looked at it and says the distributor and cap looks fine. I tried installing a new crank position sensor, that didn't fix the issue. We tried a new coil, that didn't fix it either. I'm going back to try and troubleshoot the issue some more monday. I'm thinking about replacing the camshaft position sensor just in case. Although my uncle seems to think the cam pos. sensor isn't the problem as they don't go bad often. One thing i'm not ruling out is that I got a lemon crank sensor out of the box so I might try getting one from another parts store. Any opinions would be greatly appreciated.

 

Try starting in neutral ?

 

If a CPS has failed, you will not get power to the coil. How did you determine that the coil had power? Did you throw a spare spark plug in the coil wire and determine that it was getting all the way to that point? If yes, then did you pull one of the actual plugs and determine whether spark is getting all the way to the cylinder?

If you change your mind and realize that you didn't actually have power to the coil, then the ASD relay and ASD relay fuse (in the power distribution center fuse/relay box in the engine compartment) are the first items to check upstream. If they are both good, then it might be time to re-examine the CPS possibility.

If you determine you actually have spark, but the engine isn't firing, then you need to go back to fuel delivery.

Just because there is fuel pressure (did you check with a gauge?) does not mean that the fuel injectors are being commanded to fire. You should confirm that the fuel injectors are being activated.

 

My uncle who is a mechanic tested that the coil did indeed have power going to it just none going out telling the distributor to fire the cylinders. We set a screwdriver in a spark plug wire to confirm sprak was not getting to the cylinder. My uncle hooked up a fuel pressure tester to confirm pressure yes.
I'm going to work on the jeep tomorrow and try to figure it out. I'll confirm that the coil is still getting power. I mentioned the relays to my uncle and he seems to think that they are not the issue from what he's seen. Is it possible that the cam sensor in the dizzy could be bad and telling the dizzy not to fire?

 

Could be the Cam Sensor. Examine the connector and wiring for corrosion and chafing before changing it.

 

In case anyone has this same issue it ended up being that my wire running to my distributor got burnt up and thats what caused my no start.

 

"Cranking" = "turning over", "turning over" = "cranking".

Neither means "starting".