MC2100 carb/choke troubles -
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Unread 11-18-2014, 11:43 AM   #1
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1986 CJ7 
Join Date: Apr 2013
Location: Marquette, MI.
Posts: 181
MC2100 carb/choke troubles

I have a 1986 CJ7 with a 1971 258 motor and a MC2100 carb. Last summer I replaced the electric choke and it seems to function properly. In good conditions (above 30 degrees), it seems to work quite good. Lately, the jeep has started to give me trouble. The butterfly in the carb seems to get stuck in a mostly closed position. The jeep stalls a lot, and when it runs it wont give me any power. The only way to fix it is to remove the air cleaner and push the butterfly open with my finger. There is some resistance, but not a lot and it feels like it snaps open. After that it starts and runs normally. Ive checked the linkages and pivot points on the butterfly and choke and everything is clean. There is no one in my area that will work on carbs, and I really don't think it needs a rebuild. Has any one else had these issues?

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Unread 11-18-2014, 11:50 AM   #2
Mike Romain
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1986 CJ7 
Join Date: Nov 2007
Location: Off the Grid in Chester Grant, Nova Scotia, Canada
Posts: 18,090
The pivot rod that comes out the back of the electric choke unit seizes up easily. This is the rod that goes from the bimetal spring inside out to the choke linkages. Penetrating oil can loosen it, but I find taking it apart and adding a bit of anti-seize keeps it free.
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Unread 11-18-2014, 12:16 PM   #3
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1979 CJ7 
Join Date: Oct 2005
Location: Dayton, Ohio
Posts: 1,825
I just got done putting a hedder and replaced my MC 1.08 with the MC 1.21. It is 15 degrees and I didn't even use the choke to start mine.
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