Exhaust smoke and no idle Weber 34 conversion - JeepForum.com
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Unread 03-14-2007, 07:39 PM   #1
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Join Date: May 2004
Location: San Antonio
Posts: 44
Exhaust smoke and no idle Weber 34 conversion

I have not had a bunch of time to spend working on my CJ but I did finish my Weber carb conversion. It still has a hard time starting and will not hold an idle and also there is smoke coming from the exhaust which is dark gray. Dies when I lift my foot off of the gas. When I start it, it starts right up but will not stay on unless I press on the gas pedal. I checked all of the connections even held the choke plate open and it runs the same. Today it backfired once through the carb. Could this be a fuel pressure problem. I know it has a new fuel pump on it since the last on had a hole in the diaphram. I am thinking the pressure is to high since I did not put a fuel pressure regulator on it. I really do not want to mess with the fuel mixture yet or the ide screw.

Any help from anyone that knows what might be happening please help. I would like to get my baby back on the road.


daoliv is offline   Reply With Quote Quick reply to this message
Unread 03-14-2007, 08:01 PM   #2
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1985 CJ7 
Join Date: Oct 2005
Location: The Granite State
Posts: 2,662
Backfiring is timing. I would set your timing, get a timing light and set it right. The Webers like 4 to 5 lbs of fuel pressure, a regulator does that. I know they prefer the holley FPR, I can't remember what model it is, someone else can chime in, Factory is 7lbs of fuel coming in. Check your fuel filter as well or just go new.
85' CJ7 Laredo, 383 GM, Turbo 350, NP 203. SOA, 2" frame lift, 34" TSL swampers, Dana 30 open, AMC 20 w/ detroit locker, 4:10's, 1 Piece Mosers, 35" boggers to abuse when needed.
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Unread 03-14-2007, 10:42 PM   #3
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1980 CJ7 
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yep you need a FPR and a return line back to the tank hooked up..Check your timing and for vacume leaks..
1980 cj7 258 weber,5'' of lift,33'' boggers,lincoln locked,lockright and a snorkle...Khaki Jeep Club member No. 1
1984 cj8 350 on 35's..the wifes
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