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Unread 04-03-2010, 02:30 PM   #1
SeaJay7
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84 CJ 7 starts + idles for 2mins and cuts off

it will start fine and idle for about a minute, but after that it chokes off like it's not getting the right fuel mix/air mix and then cuts off. All the emissions stuff has been removed and pluged up. The only hosing remainin are the pcv valve and the vacuum advance. I. Does anyone have an idea off what could be wrong. Vacuum line leaks are my only idea, gonna start checkin them later. One more random question. Should the vacuum advance be atached above or below the carb/manifold plate? Thankyou for your time and help. -Anthony

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Unread 04-03-2010, 03:39 PM   #2
IdahoJeeper
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Anthony....how about more info so we can assist better....what engine, what carb, what mods do you have? Do you still have/use the fuel filter with the "return" line? Just need some more info and there are lots of guys here that will gladly assist.

Good luck!!
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Unread 04-03-2010, 06:53 PM   #3
littleturner76
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You should probably give more details, like: was your Jeep running fine and this just started, or has it been parked, or did you just remove all the emmissions ect..............Check this out, kinda sounds like a problem I had. I changed just about everything I could before I tried the gas can. Read this post and it might help you narrow your problem down and save you some headache.
http://www.jeepforum.com/forum/f8/je...-2-min-783211/
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Unread 04-03-2010, 07:11 PM   #4
Cutlass327
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Quote:
All the emissions stuff has been removed and pluged up. The only hosing remainin are the pcv valve and the vacuum advance.
Unplug the line that went from the charcoal can to the tank. Let the tank breathe, and it'll run. Better thought - connect the charcoal back up so you don't have to smell the gas fumes as it vents out..
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1978 CJ5 258/T177/D300, '86 D30/D44 WT axles, 'glass tub windshield frame, and fenders, 31x10.5 BFG A/T, TDK galv'd frame - DD and weekend toy

http://www.jeepforum.com/forum/f8/ri...8-cj5-1223197/
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Unread 04-04-2010, 07:26 AM   #5
SeaJay7
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IdahoJeeper - the engine is a 258 inline 6 (5 speed). The carb is a Carter 0 (2731). I honestly don't know what the zero offest on the carb denotes. here's a link to the carb plate with all the info. http://i954.photobucket.com/albums/a...4-03185417.jpg

Littlturner76 - I got it cheap because of that. It was sitting for a bit, but ran fine to get gas to take it home, but then we came back to the guy we bought it from and parked it out front to come get later. When we came back it would start and stay running when you tap the accelerator, however if you let off it would cut off.

Cutlass327 - I'll try that.
Thankyou guys(and gals)
I also just put up some more photos
here: Pictures by SeaJay7 - Photobucket

And here are two visual questions.
http://i954.photobucket.com/albums/a...carbhelp-1.jpg
The original is here if you can please go in paint and redraw the two or 3 hoses in question correctly and reupload to imgur or somewhere please and thankyou.
http://i954.photobucket.com/albums/a...4-03190903.jpg

Here's the second question:
http://i954.photobucket.com/albums/a...utterfly-1.jpg
That is as far as the carb butterfly will close, is that enough because I was always under the impression it should be flat.

Thankyou guys for your time and help.
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Unread 04-04-2010, 07:37 AM   #6
Scooter402
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Quote:
Originally Posted by SeaJay7 View Post

Here's the second question:

That is as far as the carb butterfly will close, is that enough because I was always under the impression it should be flat.

Thankyou guys for your time and help.
That's a choke flap...supposed to be open (all the way) when the engine is warm...could be at least a big part of your problem.
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Unread 04-04-2010, 07:45 AM   #7
SeaJay7
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Quote:
Originally Posted by Scooter402 View Post
That's a choke flap...supposed to be open (all the way) when the engine is warm...could be at least a big part of your problem.
The engine is off in all of these photo's.
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Unread 04-04-2010, 07:51 AM   #8
Scooter402
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Quote:
Originally Posted by SeaJay7 View Post
The engine is off in all of these photo's.
Okay, that's fine. It doesn't necessarily "need" to be flat....all depends on the cold running/starting characteristics of your engine. If it starts up fine when its cold, there's no need to adjust the choke flap closed any more than it is.

What I am trying to say, however, is that if the choke flap remains in that position after 2 minutes of running, then the engine "begins to run roughly, as if it is not getting the right fuel/air mix, then dies" this COULD be part of the issue...choke flap blocks off airflow into the carb, richening the fuel mixture. Great for cold starts, kills it when the engine is warm. I'd make sure that your choke is opening up enough when the engine is running/warm, that's all I was saying.
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Unread 04-04-2010, 07:59 AM   #9
SeaJay7
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Ah ok, thankyou. How would i go about adjusting the choke flap?
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Unread 04-04-2010, 08:17 AM   #10
VACJ7
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If you have not downloaded the Factory Service Manual yet, get on it. Can't live without it.

http://www.jeepforum.com/forum/f8/84...ml#post6991784
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Unread 04-04-2010, 08:25 AM   #11
SeaJay7
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awesome, downloading it now, thankyou
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Unread 04-04-2010, 08:40 AM   #12
LT1CJ7
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Looks like you still have most of the emission parts to me.
If I read your post correctly,
It will stay running, but you have to keep the rpm's up when it wants to die.
Sounds like the carb needs rebuilt.
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Unread 04-04-2010, 09:01 AM   #13
SeaJay7
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ok, thankyou. sorry for double posting
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cj7 , idle , pcv , vacuum advance

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