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-   -   YJ Starting problems... (http://www.wranglerforum.com/f218/yj-starting-problems-105007.html)

Inked 07-30-2011 04:25 PM

YJ Starting problems...
 
2 Attachment(s)
Hello,

My Jeep used to have a hard start if I let it sit for over 24 hours, however recently it's been having this issue intermittently - hot or cold. I looked at my throttle body and that valve on the top seems to stay open even when engine is cold...I believe I read somewhere in this forum that this supposed to be closed? I manually closed the valve and the Jeep started right up.

How do I adjust this to the close position? I see no where on this stinkin' thing to adjust this. And if I do adjust this will this solve my intermittent starting problems on both hot or cold?

I don't know too much about these things so any help with video and pics are appreciated!!

Thanks!

ryanno3 07-30-2011 04:42 PM

I'll just press the gas three or four times and it shuts. Good luck.

kik 07-30-2011 04:42 PM

The housing to the left of the carb as you're looking at it from the front is the auto choke adjustment spring. It has a black cap with "hash" marks on it, from rich to lean. Loosen the screws, but don't remove them. Turn the black part of the housing to center and then go 1 notch rich. As you move the housing back and forth you should see your carb. flap moving when cold. If it doesn't you might have a broken spring. This would cause the choke not to set. Move it to one notch rich when cold and then try to start it. If it doesn't and you now think the spring has failed remove the black plastic housing to determine if there is a broken spring. If not, the mechanism internal to the carb. might have failed.

Inked 07-30-2011 04:45 PM

Quote:

Originally Posted by kik (Post 1423321)
The housing to the left of the carb as you're looking at it from the front is the auto choke adjustment spring. It has a black cap with "hash" marks on it, from rich to lean. Loosen the screws, but don't remove them. Turn the black part of the housing to center and then go 1 notch rich. As you move the housing back and forth you should see your carb. flap moving when cold. If it doesn't you might have a broken spring. This would cause the choke not to set. Move it to one notch rich when cold and then try to start it. If it doesn't and you now think the spring has failed remove the black plastic housing to determine if there is a broken spring. If not, the mechanism internal to the carb. might have failed.

Yes I have seen this but wasn't sure how to adjust it..I will give it a shot. Thank you!!

Inked 07-30-2011 04:46 PM

Quote:

Originally Posted by ryanno3 (Post 1423320)
I'll just press the gas three or four times and it shuts. Good luck.

will try this as well! thanks!

Inked 07-30-2011 07:01 PM

Okay i adjusted the valve plate to "closed" when engine is cold...tried to start it up and it seemed as if the engine was grasping for fuel. I played around with different settings, even going according to my Chilten's manual which was 2.4mm between the plate and the air horn wall however it still seemed like it wasn't getting fuel or air? (not sure)

I had no choice but to place it back to the original setting which was open to about 7mm in order for my jeep to start. Does this sound right? And wouldn't having the valve plate always open be the cause for my intermittent starting problems?

Also the picture attached was taken when the engine was pretty warm and as you can see the valve plate is open...am I missing something, is there some kind of electronic system controlling the valve plate as well??

Thanks in advanced WF!

Inked 07-30-2011 07:25 PM

found some good insight into how these things work..What is the choke and what does it do? — Yahoo! Autos

kik 07-31-2011 09:16 AM

Quote:

Originally Posted by Inked (Post 1423608)
Okay i adjusted the valve plate to "closed" when engine is cold...tried to start it up and it seemed as if the engine was grasping for fuel. I played around with different settings, even going according to my Chilten's manual which was 2.4mm between the plate and the air horn wall however it still seemed like it wasn't getting fuel or air? (not sure)

I had no choice but to place it back to the original setting which was open to about 7mm in order for my jeep to start. Does this sound right? And wouldn't having the valve plate always open be the cause for my intermittent starting problems?

Also the picture attached was taken when the engine was pretty warm and as you can see the valve plate is open...am I missing something, is there some kind of electronic system controlling the valve plate as well??

Thanks in advanced WF!

On these carbs if that plate is completely closed it will also cause a hard start. At this point they're probably are other issues with the carb. The plate is controlled by the auto choke housing. Unfortunately, you're probably due for a rebuild or replacement. If there is'nt a problem with the fuel pump or filter, then it would be a carb. issue. The float could be sticking also, so it seems to all go back to a tired carb.

Inked 07-31-2011 07:02 PM

Quote:

Originally Posted by kik (Post 1424969)
On these carbs if that plate is completely closed it will also cause a hard start. At this point they're probably are other issues with the carb. The plate is controlled by the auto choke housing. Unfortunately, you're probably due for a rebuild or replacement. If there is'nt a problem with the fuel pump or filter, then it would be a carb. issue. The float could be sticking also, so it seems to all go back to a tired carb.

thanks kik will definitely look into a rebuild. by the way do you know what kind of carb this is? Is this stock?


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