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Unread 10-13-2011, 04:40 PM   #1
Rammstein142
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1981 CJ5 
 
Join Date: Oct 2011
Location: Bentonville, AR
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81 CJ5 wont idle on start up just dies! HELP

Hello, this issue just started today, i noticed the other day it was idling low so i adjusted the idle and it ran fine. Today tho after going over a few bumps i normally go over in the road it began to not idle anymore and ended up dying. By the time i got to work i couldn't get it to stay on, i need help as this is a daily driver and i haven't really done to much work besides the basics of oil and tune up parts. All the work i usually hand it over to the local 4x4 shop but if this is something easy to fix id love to do it myself as it would be much quicker! Thanks!

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Unread 10-13-2011, 04:57 PM   #2
BioTex
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Do you have any idea what engine/carburator/ignition system you have installed?

Over the years things get changed alot, so there is no way for us to know, but it helps take the guesswork out.

Sounds like a fuel issue so far...

Even pictures would help.
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'85 CJ7, BDS 4" lift, 1" Body lift, 33x12.5, Shrockworks Sliders, 304 V8 with RV cam., T-176, D300, Dana 30, AMC 20.
1986 CJ10-A SD-33 Diesel/727/np208
1971 800B with 345/T-19
06' TJ Rubicon, 4" R.C. springs, BFG/AT 35s M.C. 6" fenders, rockers and surrounds, Currie front & rear adj. tracbars, tattons DC rear shaft, adj. upper - lower CA's. Bilstein 5100's
YJ Buggy Build Current project. Stroker/FI ?
1990 MJ Comanche 4.0L AX15/np231
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Unread 10-13-2011, 05:02 PM   #3
skizriz
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Checking for vacuum leaks would be a good place to start. And the cheapest.
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Unread 10-13-2011, 05:08 PM   #4
Rammstein142
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Im not sure terribly on the model of it but i can get you some pics in a few and put them up. Now you mentioned fuel issue, could it have anything to do with the crack in the hose going from my fuel tank to the fuel filter in the rear. I noticed the other day it was leaking and im planning on replacing it tom, but was wondering if maybe thats what is causing this issue? Again tho i will have pics up in a few! Thanks
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Unread 10-13-2011, 05:19 PM   #5
mopar346
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Yes, if it splits it will suck air instead of fuel. Not to mention the danger, fix it first before you do anything else.
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Unread 10-13-2011, 05:42 PM   #6
BioTex
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Ramm,
It is very possible that the rubber hoses are the original ones installed from the factory. If it were mine, I would replace ALL the rubber hoses related to the fuel.

Todays fuel (read Ethenol) is not the best for rubber hoses made back then.

It doesn't take much of a leak to get real expensive. It is worth it to get them new. Welcome to the world of CJ's!
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'85 CJ7, BDS 4" lift, 1" Body lift, 33x12.5, Shrockworks Sliders, 304 V8 with RV cam., T-176, D300, Dana 30, AMC 20.
1986 CJ10-A SD-33 Diesel/727/np208
1971 800B with 345/T-19
06' TJ Rubicon, 4" R.C. springs, BFG/AT 35s M.C. 6" fenders, rockers and surrounds, Currie front & rear adj. tracbars, tattons DC rear shaft, adj. upper - lower CA's. Bilstein 5100's
YJ Buggy Build Current project. Stroker/FI ?
1990 MJ Comanche 4.0L AX15/np231
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Unread 10-13-2011, 05:58 PM   #7
Rammstein142
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Yea they look as if they haven't been changed in quite some time the crack is around the clamp and has had a slow leak to it, but im fixing to go take pics of it all and see what you all think, i really appreciate the help! This cj is loved to death, but its time for it to become a little more reliable!
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Unread 10-13-2011, 06:43 PM   #8
Rammstein142
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1981 CJ5 
 
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Location: Bentonville, AR
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Pics of Carb and cracked line.

https://www.facebook.com/photo.php?f...type=3&theater

https://www.facebook.com/photo.php?f...type=3&theater

https://www.facebook.com/photo.php?f...type=3&theater

https://www.facebook.com/photo.php?f...type=3&theater

also do you think i could place some tape over the cracked lines or fill them in with super glue or something so i can make it home if thats the issue causing it to not run?

Last edited by Rammstein142; 10-13-2011 at 07:19 PM..
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Unread 10-14-2011, 06:45 AM   #9
BioTex
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Looks like a Carter YF carb to me. That would mean you have the 4 cylinder engine correct? Hard to tell in the close ups.

I'm thinking fuel starvation at this point, so a couple of things come to mind to check or repair.

You could have a plugged filter. I would start there. Change it out.

If that doesn't fix the problem, I would suspect the idle passages are plugged. This means a carb cleaning or rebuild. About $30 in parts if you do it yourself.

Another thing could be the EGR not working. They do get stuck occasionaly, and need cleaned.

Finally, the fuel pump might be weak. This could be due to it sucking air because of the cracked lines. I'd replace them and take the guesswork out.

Oh, and make sure there are no vacuum leaks.
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'85 CJ7, BDS 4" lift, 1" Body lift, 33x12.5, Shrockworks Sliders, 304 V8 with RV cam., T-176, D300, Dana 30, AMC 20.
1986 CJ10-A SD-33 Diesel/727/np208
1971 800B with 345/T-19
06' TJ Rubicon, 4" R.C. springs, BFG/AT 35s M.C. 6" fenders, rockers and surrounds, Currie front & rear adj. tracbars, tattons DC rear shaft, adj. upper - lower CA's. Bilstein 5100's
YJ Buggy Build Current project. Stroker/FI ?
1990 MJ Comanche 4.0L AX15/np231
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