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Unread 04-11-2010, 11:23 AM   #1
jayhhaynes
Registered User
1988 YJ Wrangler 
 
Join Date: Dec 2009
Location: Orange Park Florida
Posts: 69
webber carb vacum problems

carb was set up like this when i bought this jeep about 7 months ago. when i go wheelin, or any time i run it at high rpms the motor makes a loud sucking noise through the carburetor. It begins when i first give it a little bit of gas then begins to suck. if i give it around 50% throttle or it will rev up high then suck and do this repeatedly til i let off. if i hold it at around 10% it will make a loud sucking noise and shut off. if i try to drive like this it will jerk the jeep back in forth as i go down the road. I usually can get it to stop if i hold throttle at around 1000rpms right befor it dies then give it gas and there will be a loud pop coming from the carb and i can drive as normal.
this is my first carburetor and I'm still learning bout them.
thanks for your help



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Unread 04-11-2010, 12:05 PM   #2
PrinothPro
Registered User
1990 YJ Wrangler 
 
Join Date: Mar 2009
Location: Park City, UT
Posts: 364
Whoa. First thing you must do is replace the filter! It look like it is clogged with dirt...

I noticed there is a hose just hanging out barely on left side of the choke, I would check that out. You should replace all the gaskets. They tend to rot out and create spots for air to suck in. I discovered my weber has one of the gasket half missing.

Is your jeep nuttered? Those webers do excellent when jeep is nuttered.

Also, welcome to the forum, you will find several good people on here who is very knowledgeable about weber more than me so they will come out and help you.
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Unread 04-11-2010, 03:01 PM   #3
PoppaDucky
Registered User
1997 ZJ 
 
Join Date: Jan 2010
Location: Telephone, Tx, Texas
Posts: 118
Here's a link to the thread I used to get my vacuum issues right. Keep in mind though that these are with a nutter bypass. I went ahead and replaced all my lines to eliminate leaks and used the diagram on post 23 to figure out what sizes I needed and where they ran. The diagram in post 26 shows the setup on a carb. http://www.jeepforum.com/forum/f8/we...96/index2.html

From the looks of it, you've got a 32/36 so here is a link to someone installing it from the beginning: http://www.jeepforum.com/forum/f140/...nstall-382317/
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