Do we really have over 180 posts, and no compression readings? Please say it's not so, I missed something.

If it were low compression, both oil getting up there to up it, (by cranking a bit), or quick start could tip the scale to get it to fire.

Handy#'s to know at anytime anyway.

 

Just read the op's first post. Spark and fuel were suspected 180 posts ago and I guess that's the only track willing to be considered.

The over/under on this thread is now 230 posts before either give up or diagnosis confirmed.

 

The ICM cured it then it died when the CPS wires got burned so the original problem was found and fixed. Maybe something else was damaged when the wires shorted, no clue. Have you tried quickstart? Do you still have a spare ecu to try with? You could try checking timing while cranking. If you have spark and fuel the only thing I can think is that the computer got messed up and is throwing the timing.

 

For one, if compression was low, it wouldn't run as well as it does. Secondly, I work two jobs and have other more important stuff to deal with, I'm just testing and trying to diagnose in my 30 minutes of free time. Also, I don't have money to even put the deposit down for the rent a tool programs. Why do you think I'm working two jobs? I'm trying and doing the best I can with what little free time I actually do have.

Another thing, I took the CPS that I thought had melted wires, off of the bellhousing, but the wires weren't melted, just the outer protective cover.

 

Also, yes, I have tried switching out ECUs, I have two and it is doing the same thing on both of them.

Yes, I replaced the distributor cap, rotor, ignition coil, spark plugs, and spark plug wires. Still acting strange. The starter on there is the original one that was on there when I bought the Jeep. I've tested the CPS and it tests fine. I'm getting spark and fuel. New battery. I will be getting money from my second job soon, as I recently started working there. When I do, I will buy a compression tester. I'm not giving up.

 

Not really trying to come off rude, just "sharing" what I'd do in your shoes. I get it it's no fun when your Jeep won't start! No need to buy the tester, I usually use a card to borrow one from the auto parts, then just have it credited back on return. Like I mentioned, something to rule out, and never bad to know those #'s anyway. Pretty easy except for #1 behind the AC compressor...

 

I'm buying one, because you're right, it's not a bad thing to know those #s. All of the work on my vehicles, I do myself, so owning a compression tester is never a bad thing.

In fact, I bought one tonight for less than $15. So, when I get a chance, I'll test the compression and let you know. Thanks.

 

No -the new ICM didn't cure it. Re-read the posts. The forum did not recommend changing it out either.

He said he changed the ICM and it ran fine but then stopped and he said the CPS wires were melted on the manifold but now apparently the CPS is ok again.

Ether=quickstart and that's been tried and it starts right up on ether/quickstart and then runs on fuel after it's started on ether. Therefore spark and fuel for the most part are also ruled out. I can't see it being an ECU issue as it runs fine once started and he is able to drive it to get gasoline etc. The ECU is controlling injector pulses which is why it runs after starting.

Something else more simple is missing here which is why I asked about wires, rotor, cap, plugs...

I'm still sticking to a bad CPS or slow starter speed.

 

Read up on how to use one (see youtube video) before getting too excited. You would need bad compression on a lot if not all of the cylinders to create a no-start condition-one bad reading will just lead you down another rabbit hole I think.

Low compression on starting could be from slow starter speed too. A new starter is a bit expensive. Could look for a JY unit that is good.

 

I only thought the CPS wires were melted, because as far as I could tell in the dark at 4:45am with a phone flashlight, they were melted. But when I got home later that day and took it off, I noticed they weren't melted, just the outer rubber sleeve.

 

[QUOTE=matt0106;3169680... but low and behold, the CPS wires touched the exhaust manifold and melted. So, when I get home, I gotta replace that.

"I only thought the CPS wires were melted, because as far as I could tell in the dark at 4:45am with a phone flashlight, they were melted. But when I got home later that day and took it off, I noticed they weren't melted, just the outer rubber sleeve. "[/QUOTE]

Hey-We're not psychic-You said "wires" and there's only the single insulated harness with the two wires inside the sheath. We can only go by what you write on here.

 

Nah, it's cool. I just thought that the wires themselves were melted when I posted that, but I got home after that and checked and it was just the harness that the wires are in that had melted, that's why I posted.

 

So, I know it's been a while.

BUT!

There's been a new development in this saga!
It has been starting on it's own, no starting fluid, for the past few days.
Don't really know what that means, if that's good or bad.

Anyways, just thought I'd update you guys. I'll post the compression test readings, when I finally get around to it.

 

Supper! Had we ruled out our funky fuel where just a little water makes it separate into funky stuff in the lower........Glad it's working out for you.