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Unread 11-28-2013, 08:55 PM   #1
wsmutch
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1986 CJ7 
 
Join Date: Apr 2013
Location: Marquette, MI.
Posts: 142
Cold engine racing

I have a CJ-7 with the 258 IL6 and MC2100 carb with most of the pollution gear removed. When I start it it idles a little fast, but after a few minutes it really revs up and stays at high revs for quite a while, in fact I always have to kick it down with the gas pedal because I'm afraid of damaging the motor. Once warmed up it idles fine. I can't start it and let it warm up while I do get ready for say work. Is there an adjustment for the cold idle? Pictures would be helpful too please.

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Unread 11-28-2013, 09:26 PM   #2
capt205
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1983 CJ7 
 
Join Date: Aug 2012
Location: Florida, FL
Posts: 411
Choke idle needs adjusting. More than likely, the screw on passenger side of carb behind the choke. Adjusts from the back side of carb
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Unread 11-29-2013, 04:59 AM   #3
wsmutch
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1986 CJ7 
 
Join Date: Apr 2013
Location: Marquette, MI.
Posts: 142
Thanks, I'll try that. It's been below freezing here for days, and it won't get much better anytime soon.
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Unread 11-29-2013, 05:08 AM   #4
Matt1981CJ7
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1981 CJ7 
 
Join Date: May 2011
Location: Elbert, CO
Posts: 10,970
How fast is "it really revs"? Have you taken an RPM reading?

A higher than usual idle is normal when the choke is engaged, usually around 1500-1800 RPM.

"Kicking it down with the gas pedal" is also normal operation for a carb'd engine.

Matt
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