Jeep dies suddenly - Page 3 - JeepForum.com

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post #31 of 82 Old 08-17-2013, 03:43 PM Thread Starter
Gigemags05
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Not close. It's running down the opposite rail

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post #32 of 82 Old 08-17-2013, 03:46 PM Thread Starter
Gigemags05
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My transmission is an auto ( tf999).


Is there a chance it's the torque converter? The tc is brand new when I did the swap.

I'm just brainstorming because it seems to be happening now when I've just shifted into reverse. Although sometimes it runs just fine after shifting and accelerating. It also doesn't buck or jump.
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post #33 of 82 Old 08-17-2013, 03:53 PM
LumpyGrits
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I will still say it's the FP.
I would think it should give higher PSI than 40. Like 40-50.
What rpms did you test the psi at?
Run a 'hot' lead straight from the batt. POS.(+) to the POS.(+) on the FP.
IF, the engine still dies-----Gotta be the FP.
How is the FP grounded? Is it a dedicated ground to the frame?
BE CAREFULL !!!!
Did you ever open up that fuel filter like I asked you to do?
LG
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post #34 of 82 Old 08-17-2013, 03:59 PM
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Quote:
Originally Posted by Gigemags05 View Post
My transmission is an auto ( tf999).


Is there a chance it's the torque converter? The tc is brand new when I did the swap.

I'm just brainstorming because it seems to be happening now when I've just shifted into reverse. Although sometimes it runs just fine after shifting and accelerating. It also doesn't buck or jump.
TC lock up is possible. But you say it dies under load and coast, so I don't think it's the tranny.
LG
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post #35 of 82 Old 08-17-2013, 04:47 PM Thread Starter
Gigemags05
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I tested the fp at multiple rpms. It's holding at 34-40.

On my harness, there is a fuel pump 12 v wire and a ground. I ran the 12v to the fp pos. I ran the ground to fp neg. I then ran a wire from fp neg to the frame.

I tried running a hot wire from fp pos to the battery but the pump doesn't prime or turn on. Not sure why.

I couldn't find the right filter at auto zone so I haven't done that yet. I'll try it tonight or tomorrow am.
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post #36 of 82 Old 08-17-2013, 05:08 PM Thread Starter
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I just drove it around the block a few times to get a better handle on when its dying.

It'll idle just fine.
When in reverse, it dies about 3/4 of the time within the first 20 ft. Of backing up.
It died while coasting down a hill.
It sputtered when I punched it one time and died shortly after.
Also died when I put it in park right when I got home.
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post #37 of 82 Old 08-17-2013, 05:35 PM
LumpyGrits
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With what you say.
IF your Jeep was mine, and ALL the test'n you have done.
I would SWAG that there is an intermittent issue within the FP.
First call to FI maker again, and get the head tech. Refer him to this site.
Take notes on what he sez.......
See if they will send you another FP under warranty/good will.
I'm no wiz on FI, but 34-40psi doesn't sound like allot when my Subaru's run 50+psi rail pressure.
LG
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post #38 of 82 Old 08-17-2013, 05:50 PM
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The early (thru '95 or '96) Mopar 4.0 MPFI runs at 39psi. This is the system the Hesco MPFI is built around. Later setups run at 49 psi rail pressure.
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post #39 of 82 Old 08-17-2013, 05:52 PM Thread Starter
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I think the pump is still under manufactuers warranty. I'll call them and see what they say.


I've spoken with the people who make the harness for the swap ( hesco) a few times and they are saying it has to be the computer because its throwing codes for components that don't exist like an ac clutch and electric fan circuit.

But according to the swap threads/ experts, all the computers throw those codes and they have none of the issues I'm having. Not to mention, the computer has thrown those same three codes since I've done the swap.
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post #40 of 82 Old 08-24-2013, 07:24 PM Thread Starter
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Alright, I think I finally found the issue.


It's somewhat anti climatic after all the leads I've chased down, and can probably be attributed to my own ignorance or inexperience.

But after checking the fuel filter, I went to replace it with a new one. I was feeling around the wiring casing on the fuel pump wiring and felt a rough spot/ snag. Turns out, the wiring had rubbed against something and was almost rubbed completely through.

I fixed it, installed the filter and haven't had the problem since. I had previously checked the wiring, but hadn't felt the top of the casing, and this was out of sight.

Anyways, hopefully this thread can die now. I really, really appreciate all the help and advice.
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post #41 of 82 Old 08-24-2013, 07:30 PM
LumpyGrits
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I would sleeve that wire.
LG

Have'n you along, is like loose'n 2 good men
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post #42 of 82 Old 08-24-2013, 07:46 PM Thread Starter
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I did just that this afternoon.
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post #43 of 82 Old 08-28-2013, 08:35 PM Thread Starter
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Well, dang it, I thought I had this fixed, and I drove it all around for a few days thinking I ha it fixed without any issues. I figured it was fixed because it went all over without any problems.

Then tonight... It did the same thing. Randomly died then started right back up.

I got under it and looked at the wiring and it was really hot to the touch. Could that mean there's a short somewhere in the wiring?
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post #44 of 82 Old 08-28-2013, 09:28 PM
LumpyGrits
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What wire was hot?
Gotta know this.
LG

Have'n you along, is like loose'n 2 good men
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post #45 of 82 Old 08-29-2013, 06:11 AM Thread Starter
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The fuel pump wires were really hot to the touch.
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