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Unread 07-01-2013, 05:32 PM   #1
Gigemags05
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1980 CJ7 
 
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I have completed the 4.0 swap in my 80 cj and it has run great for 3 months.

So I flat towed it around 500 miles (disconnected the ds) to the beach.

Everything was going great, but today it just died suddenly. I turned the ignition off, put it in park, and started it up and drove on with no more problems for the morning.

This pm, I experienced the same problem. Again, it fired right back up and got us he with no problems.

It's not throwing any codes.

Any ideas? Injectors? Fuel pump? It's a brand new e2000 pump.

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Unread 07-01-2013, 05:35 PM   #2
OldTexas
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Quote:
Originally Posted by Gigemags05 View Post
I have completed the 4.0 swap in my 80 cj and it has run great for 3 months.

So I flat towed it around 500 miles (disconnected the ds) to the beach.

Everything was going great, but today it just died suddenly. I turned the ignition off, put it in park, and started it up and drove on with no more or
Three possibilities come to mind. First is a fuel filter. Second is the ingnition control module and third is a coil. Any of those three could do that.
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Unread 07-01-2013, 05:36 PM   #3
SLO_Ken
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I understand this is a common symptom of an intermittent CPS sensor.
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Unread 07-01-2013, 05:55 PM   #4
Gigemags05
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SLO ken, are you saying its a symptom of my cps going out? Or the cps being spaced wrong?
If I have the hesco cps I guess I'd have to order a new one through them?

So I need to check the coil and replace the filter? Both of those are brand new, but that's definitely in the realm of possibility.
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Unread 07-01-2013, 07:48 PM   #5
Gigemags05
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Are there any other obvious things to check? I'm going to try and check all these things tomorrow.
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Unread 07-01-2013, 08:52 PM   #6
SLO_Ken
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Quote:
Originally Posted by Gigemags05 View Post
SLO ken, are you saying its a symptom of my cps going out? Or the cps being spaced wrong?
If I have the hesco cps I guess I'd have to order a new one through them?

So I need to check the coil and replace the filter? Both of those are brand new, but that's definitely in the realm of possibility.
It's a symptom of the CPS going out. I'm pretty sure Hesco uses the OEM sensor on a custom bracket/balancer. You should be able to get the sensor from the local parts store, or someplace online. I think I got mine at RockAuto for less than $50.
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Unread 07-01-2013, 09:06 PM   #7
Gigemags05
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Alright thanks.


I'll look into it. Pretty disappointed that my jeep is, for all practical purposes, shut down for our trip. We were heading to the national seashore to explore when it started acting up.
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Unread 07-11-2013, 05:30 PM   #8
Gigemags05
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I checked all the suggested causes out and they all seemed to be good, other than the cps. Not really sure how to check that out.

It actually has been running great the last week, but today it does twice. Seems to happen when I'm coming out of a turn.

I'm thinking ken was onto something with the cps.
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Unread 07-12-2013, 04:03 AM   #9
RWise
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Quote:
Originally Posted by Gigemags05 View Post
Seems to happen when I'm coming out of a turn.
Until this I was with the cps, but now I have to ask, has the pick up tube in your fuel tank been checked lately? They can rust off or rust a hole in them, then when you turn the tube (or the hole in it) is above the fuel and it dies (no fuel pressure), you stop, the fuel pump grabs fuel again and off you go!
Good luck!!

EDIT this should get worse as the fuel level goes down if it is the pick up tube!
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Unread 07-12-2013, 07:07 AM   #10
Gigemags05
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No I haven't checked it.

Any advice on how to check it?
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Unread 07-12-2013, 09:34 AM   #11
LumpyGrits
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Check your ign switch & wiring.
Die'n while com'n out of a turn is tell'n me it's a contact issue(MAYBE),inside the ign switch.
Also, the reason you see no codes, also makes me think ign switch issue cause the eng. 'thinks' you turned it off.
LG
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Unread 07-12-2013, 09:57 AM   #12
Gigemags05
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Dumb question:

When you say check the ignition switch and wiring, how do I do that? I'm not sure where to start.
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Unread 07-12-2013, 10:05 AM   #13
LumpyGrits
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Let GOOGLE be your friend.......
http://www.jeepforum.com/forum/f8/ig...-test-1220614/

Lots of info out there.
LG
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Unread 07-12-2013, 11:58 AM   #14
LumpyGrits
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Quote:
Originally Posted by Gigemags05 View Post
No I haven't checked it.

Any advice on how to check it?

FILL the gas tank and drive it.
Where is the FP mounted? Is there a filter before the pump?
Also check your ele. fuel pump and it's wiring.
Make sure the fuel line connections are good and 'tite'.
LG
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Unread 07-12-2013, 12:08 PM   #15
Gigemags05
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Fuel pump is mounted as close to the tank as I could get it right along the rear crossmember.

Yes there is a new fuel filter before the pump.

All lines and connections seem good.

I went ahead and pulled the switch. It was awful dirty and one of the connections didn't seem good so I just replaced it.

If the problem persists I'll at least know its not the ignition switch.
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