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Go Back JeepForum.com > Models > Jeep Wrangler Forums > YJ Wrangler Technical Forum > Smoke out of PCV. Stalling. Smell gas.

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Unread 09-16-2009, 10:07 PM   #1
kylelikewhoa
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2006 LJ Wrangler 
 
Join Date: Jan 2009
Location: Franklin, Mass
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Smoke from PCV. *EDIT* Added picture and video.

I'm helping out a friend with a YJ he just bought. It has a 4.2l motor in it. It is completely missing the PCV valve and there is a autozone breather cone filter in the breather for the PCV at the other side of the valve cover. And there is smoke coming from both the PCV breather and the PCV valveless hole.

If you let it idle for a few minutes, it will stall and it's pretty tough to get it running again. It will run, but after cranking it a few different times. And through all this, I can smell gasoline.

Also I've been searching trying to find hose routing diagrams. There is a hose coming off the carbeurator with a spark plug jammed in it that I'm not sure where it is supposed to go to (I think the PCV plugs into it, but I'm not sure).

I dont know much about this motor, and have never work with anything carbeurated before so any help will be appreciated.


*Edit*

After running it for a few minutes after putting on the new muffler, the exhaust out of the tail pipe was extremely hot and the muffler looked like this...


Also, I pulled a spark plug wire before I shot the video, and forgot to plug it back in. Forgetting to plug it back in didnt change how it ran from before though, so now I'm thinking it might have a dead cylinder. Compression test will be performed this weekend.

Here's a video of the smoke.

[yt]<object width="425" height="344"><param name="movie" value="http://www.youtube.com/v/R6CKLVcm8rw&hl=en&fs=1&"></param><param name="allowFullScreen" value="true"></param><param name="allowscriptaccess" value="always"></param><embed src="http://www.youtube.com/v/R6CKLVcm8rw&hl=en&fs=1&" type="application/x-shockwave-flash" allowscriptaccess="always" allowfullscreen="true" width="425" height="344"></embed></object>[/yt]

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Last edited by kylelikewhoa; 09-17-2009 at 06:13 PM.. Reason: Added picture and video.
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Unread 09-16-2009, 10:16 PM   #2
bigh20rnr
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Here is an excellent writeup on the 4.2L carb.Dale's Jeep Junk - Carburetor It is for the CJ but most of the information is very relevant. The "adventures under the hood" section will give you a lot of information about the vacuum and emission controls. If the Jeep is stock here is a diagram.emissionsvacuumlinediagram-color.gif

Rick
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Unread 09-17-2009, 09:03 AM   #3
kylelikewhoa
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Thank you bigh20rnr, that helps alot.

The more I read into it, the more I'm thinking it doesnt have the stock carbeurator on it too. I'll take a picture today and post it up.

And does anyone have any idea about the smoke coming out of both the holes for the PCV?
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Unread 09-17-2009, 12:13 PM   #4
bigh20rnr
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Your welcome! It would not surprise me if the carb has already been swapped out by the prior owner. If its an aftermarket carb and the nutter bypass has been done you will not need hardly any vacuum lines. Here is a diagram of how I (and many others) have their vehicles set up.

vacuum-diagram-after-weber-install.jpg

If you are not sure what a nutter bypass is here is a quick diagram of how it works.
Ignition module before nutter
ign.gif

ignition module after nutter.
ignnocpu.gif

As far as the smoke is concerned, I really do not know what to tell you on that one. Do you think the rings are allowing blowby? Have you tried a vacuum test yet?

Rick
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Unread 09-17-2009, 02:30 PM   #5
kylelikewhoa
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I havent tried a vacuum test yet, I would like to do a compression and leak down test on it as soon as I can. Thank you for the diagrams though. Nothing is routed correctly so far.

Also, the butterfly in the carbeurator doesnt move with the throttle. I can move it with my hand and get it running and keep it running, but it eventually falls closed and it stalls.

AND we put a new muffler and tail pipe on it today and the exhaust is getting so hot that it is practically melting the muffler. It is also backfiring a ton.
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Unread 09-17-2009, 02:35 PM   #6
MONEYJPIT
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Quote:
Originally Posted by kylelikewhoa View Post
I havent tried a vacuum test yet, I would like to do a compression and leak down test on it as soon as I can. Thank you for the diagrams though. Nothing is routed correctly so far.

Also, the butterfly in the carbeurator doesnt move with the throttle. I can move it with my hand and get it running and keep it running, but it eventually falls closed and it stalls.

AND we put a new muffler and tail pipe on it today and the exhaust is getting so hot that it is practically melting the muffler. It is also backfiring a ton.
If you mean the butterfly on top, then that is your choke. Choke needs to be open to run.....or the engine will choke and stall.
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Unread 09-17-2009, 06:03 PM   #7
kylelikewhoa
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Quote:
Originally Posted by MONEYJPIT View Post
If you mean the butterfly on top, then that is your choke. Choke needs to be open to run.....or the engine will choke and stall.
Yep, that's exactly what I mean.
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Unread 09-17-2009, 06:50 PM   #8
Yarz
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Quote:
Originally Posted by kylelikewhoa View Post
It is completely missing the PCV valve
It looks like you have the PCV valve on the front of the valve cover... Did you add it after your post but before adding the video?

Quote:
Originally Posted by kylelikewhoa View Post
The more I read into it, the more I'm thinking it doesnt have the stock carbeurator on it too. I'll take a picture today and post it up.
I can't quite tell from the video, but the carb looks very similar to my stock carb, except for the air cleaner mounting assembly.

Quote:
Originally Posted by MONEYJPIT View Post
If you mean the butterfly on top, then that is your choke.
X2.. The choke shouldn't move with the throttle, except maybe the first pedal push before starting that closes the butterfly, thus putting the choke on.
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Unread 09-17-2009, 07:04 PM   #9
kylelikewhoa
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Quote:
Originally Posted by Yarz View Post
It looks like you have the PCV valve on the front of the valve cover... Did you add it after your post but before adding the video?



I can't quite tell from the video, but the carb looks very similar to my stock carb, except for the air cleaner mounting assembly.



X2.. The choke shouldn't move with the throttle, except maybe the first pedal push before starting that closes the butterfly, thus putting the choke on.
Yeah I added the PCV before taking the video.
And it could be the stock carb, I'm not sure, I've never worked with a carbeurated Jeep before.
And the choke doesnt move at all, not when you push the pedal or anything.
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