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Unread 12-15-2011, 01:21 PM   #1
mgkbull
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1987 YJ Wrangler 
 
Join Date: Jun 2011
Location: Albuquerque, NM
Posts: 161
Still having engine trouble.

So my YJ has been steadily running worse. It's the holiday season and cannot afford a mechanic at the moment, so I'm hoping I can fix this myself as well.

When first getting the thing started it chugs a bit and then smooths out. It'll sit there and idle just fine all day long. Soon as I start going up some hills though, under load, it starts bogging down. I smell gas and then it dies. It also uses a lot of RPM's. Usually I shift to third right when it's at 2k rpm and at 30mph. Now I can shift to 3rd at 20mph. Timing?
And then, after it's bogged down, I pull the air cleaner off and see a huge cloud of white vapor/smoke coming out of the carburetor. It just sits there until I blow it away. What is this white stuff?
And thennnn, there's this guy:

It's a very rusted (surprised here because cars don't rust in New Mexico lol) pipe right next to the main exhaust pipe. I noticed it because there was smoke coming from the side of my Jeep and it smelled very "gasy". What does it do? Could this be the source of my issues performance wise?

Thanks in advance folks.

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Unread 12-15-2011, 02:39 PM   #2
mgkbull
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1987 YJ Wrangler 
 
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Location: Albuquerque, NM
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Just looked at my spark plugs too. They are all coal black with bits of tacky white on them.
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Unread 12-15-2011, 04:38 PM   #3
oldtime_ironman
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1991 YJ Wrangler 
 
Join Date: Dec 2010
Location: 14304 Niagara Falls, NY
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Hrm, that' weird. I'm not real familiar with the carbed jeeps, but I know the white fog you saw when it sputtered out, is normal for a carb when it sputters out. That's just your gas-air mix that the carb was doing. Just don't smoke around it!

Far as the pipe, one of the other guys is gonna have to help with that one - its not the stock exhaust? I dunno.
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Unread 12-15-2011, 04:40 PM   #4
oldtime_ironman
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BTW it might be a real good idea to get a carb rebuild kit and some carb cleaner. I used to do a lot of GMC carbs.... some experience with carbs there. Its running way too rich, judging by the plugs and the gas smell. You can prolly redo the carb and re-adjust it for less than $30.
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Unread 12-15-2011, 04:50 PM   #5
stroker90
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1990 YJ Wrangler 
 
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Location: chambersburg, pennsylvania
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the rusted out pipe is connected to the catalytic converter and is part of the emission system. it should connect to a check valve that is connected to the air cleaner. You should look into getting the carb rebuilt. I got tired of rebuilding my carb and always adjusting the choke so I switched this year to fuel injection.
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Unread 12-15-2011, 10:07 PM   #6
mgkbull
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1987 YJ Wrangler 
 
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I wish I could afford getting a FI. I just rebuilt this carb in July. Shouldn't need it again that quickly! Thanks for the info on that pipe. So is it important that I get that fixed, other than it just smelling bad?
What's the best resource for tuning that carb? Anyone got a link?
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Unread 12-15-2011, 10:19 PM   #7
Old4X
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You need to repair or remove the pulse-air system (the rusty pipes in the photo). They are allowing unfiltered air into your carb, not good.

Check that your Idle tubes aren't leaking. (google "Carter BBD idle fix " if you aren't familiar with this common problem).

Tuning the carb can go 2 ways. Do you have emission inspections ?
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Unread 12-17-2011, 10:06 AM   #8
mgkbull
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Yes we have emissions here, but I don't have another one for two more years.
How do you mean, remove the pulse-air system? How can I do this? Is it hard to do? Thanks for the replies.
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Unread 12-17-2011, 10:14 AM   #9
mgkbull
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I'm reading the "Fix for Idle problem" and have noticed something different about my Carter BBD carb. When I hit the gas, gas comes out of the Venturi tubes, but also some comes out in between them. Is there a separate tube that injects gas into the system?
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Unread 12-17-2011, 10:49 AM   #10
mgkbull
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Also, this is has been nuttered, if that makes any difference.
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Unread 12-17-2011, 01:06 PM   #11
mgkbull
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OK, I just pulled the carb apart again and adjusted the float level and pulled the stepper motor out some more. Still running with high RPM though. Idle is fine, runs smooth. But when driving I can shift to third at 2k rpms at only 25mph. Again, usually it takes me to hit 30mph before I hit 2k rpms. it's better than where it was, at 20mph. So I've done something right?
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Unread 12-17-2011, 02:27 PM   #12
mgkbull
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Location: Albuquerque, NM
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Can the bad spark plugs cause it to run at higher RPMs?
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carburetor , exhaust , fuel , timing , vapor
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