Cold engine racing -

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post #1 of 4 Old 11-28-2013, 07:55 PM Thread Starter
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1986 CJ7 
Join Date: Apr 2013
Location: Marquette
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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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post #2 of 4 Old 11-28-2013, 08:26 PM
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1983 CJ7 
Join Date: Aug 2012
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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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post #3 of 4 Old 11-29-2013, 03:59 AM Thread Starter
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1986 CJ7 
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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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post #4 of 4 Old 11-29-2013, 04:08 AM
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1981 CJ7 
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Location: Elbert
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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.

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