cold start with mc2100 question - JeepForum.com
 
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post #1 of 6 Old 03-18-2014, 10:53 AM Thread Starter
neal90
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cold start with mc2100 question

So with all the help I have received from everyone the jeep is running very well with the new carb... except when cold. When I first start the jeep it turns over and starts but the ideal is only around 450-500 rpm (and than around 650 when warmed up) I have a manual choke that I just installed I have also made sure its working correctly, but there is no change in the rpm if the choke is open or closed. Is there some kind of adjustment on the carb that I'm missing on the choke side of the carb???

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post #2 of 6 Old 03-18-2014, 11:21 AM
scrapman
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Quote:
Originally Posted by neal90 View Post
So with all the help I have received from everyone the jeep is running very well with the new carb... except when cold. When I first start the jeep it turns over and starts but the ideal is only around 450-500 rpm (and than around 650 when warmed up) I have a manual choke that I just installed I have also made sure its working correctly, but there is no change in the rpm if the choke is open or closed. Is there some kind of adjustment on the carb that I'm missing on the choke side of the carb???
Yep, sounds like you haven't set the fast idle cam adjustment, or are not depressing the gas pedal fully after you set the choke to allow the linkage to get to the fast idle cam adjustment. Page 26 of this link: http://street2mud.com/webfiles/MC-21...%20a%20258.pdf

shows the linkage.
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post #3 of 6 Old 03-18-2014, 02:56 PM Thread Starter
neal90
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ok I see the fast ideal cam and I closed the choke and made the adjustment and with the choke closed I set it to 1000 rpm. I opened the choke and gave the jeep a little gas and the rpm went down to 650. So that worked but when i closed the choke and started the jeep again it seems like the choke won't close enough to engage the part of the fast ideal cam the steps up the rpms. Im not sure what I'm doing wrong
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post #4 of 6 Old 03-18-2014, 03:37 PM
jeepwhore
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You have to press the pedal to the floor, pull the choke, then release the pedal if you want to engage the high idle with a manual choke.

'84 CJ-7: Yota axles (spartan locked front, e-locked rear) 4" BDS, 1" Daystar & 3/8" shackle lifts, 35" X-Terrains on steelies, YJ Tub & family roll bar, heater blower upgrade, 4.2L w/MC2100 & Team Rush, Warn 8274. Rebuilt 4.2/4.0 hybrid, AX15 and twin sticks/clocking ring waiting to go in.

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post #5 of 6 Old 03-18-2014, 04:23 PM Thread Starter
neal90
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Thats what I was thinking thanks
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post #6 of 6 Old 03-19-2014, 06:08 AM
Mike Romain
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You also want the fast idle rpm to be about 1800. That makes the next step down about 1200-1300 and then idle.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG AT's, 'glass nose to tail in '00, 'New' frame,wires and plumbing in '09. Carter BBD Carbed 4.0 HO in '10.
89 YJ Renegade. BBD Carbed 4.0 HO. Locked front and rear with 33x9.5 BFG AT's
Some Canadian Bush Jeep Runs and Build Photos: http://mikeromainjeeptrips.shutterfly.com (10 new albums added Sept 16/10)
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