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Old 02-04-2012, 09:34 PM   #1
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Need help with vacuum on mc2150 plz!

Hey everyone, Just bought a MC2150 from the ebay guy and so far its a great kit and included everything I needed and the install was a breeze but I need help hooking up my vacuum lines. The only lines I know for sure that are correct is the fuel line. There are many ports on the carburetor and some of the diagrams I found isn't really helping me. Does anyone have a MC2150 installed on there wrangler and can snap some pictures of exactly which vacuum lines I NEED and where they go so I can get it running just perfect, I dont care about emissions at all. At the moment its starts and idles at 1500 rpm and that's only with the gas line and 1 pcv vacuum connected. I still haven't messed with the distributor to advance the timing, Can someone also help me with that too on how to advance the timing without using a timing light. Any help would be great please.
Thanks in advance.

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Old 02-05-2012, 01:41 AM   #2
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Old 02-05-2012, 11:43 AM   #3
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Anyone ???
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Old 02-05-2012, 12:36 PM   #4
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Do you have the choke setup yet? And the only thing I hooked up was pcv and fuel and vaccum advance. It runs great and I didn't retime it. You will have all kinds of vaccum lines with no where to go, poug them.
hope this helps, I am no expert though!
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Old 02-05-2012, 03:25 PM   #5
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Yes I have an electric choke that was already setup and installed on the carb before i received it from the ebay guy. I hooked up the same ezact vacuum line you did just wondering if I need to connect anything else as far as getting better gas mileage or something. Also on cold starts it runs very rough and is hard to start and I have to hold the gas till it warms up then it runs perfect and idles perfect? is this a bad electric choke? or did I mess something up with crossing lines?? help please!
I know its Superbowl Sunday but we still have a few hrs here lol.
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Old 02-05-2012, 03:35 PM   #6
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I got the manual choke so can't be sure on that. I would take air cleaner off and have someone start it when its cold and look to see if the choke is working. I actually installed and tuned mine before choke was on as to eliminate issues if I had any. Hope this helps.
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Old 02-05-2012, 04:04 PM   #7
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The flap ontop of the carb is completely closed on cold starts. Is that normal ? when it warms up that flap or butterfly opens up?
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Old 02-05-2012, 05:34 PM   #8
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Yes i think thats normal, thats what the choke is supposed to do. Whats the rpm that you have to keep it at to keep it running when its cold?
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Old 02-05-2012, 11:11 PM   #9
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I keep it around 2500 rpm to keep it running on a cold start
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Old 02-06-2012, 04:16 PM   #10
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Aright so far Iv been driving the car around and its kinda dialing itself in I guess. So far everything has slowly started to fix itself and its running ok now just need to know how to advance the timing so I can get the full potential power out of this 4.2L ? anyone?
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Old 02-07-2012, 06:42 PM   #11
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Old 02-24-2013, 02:59 PM   #12
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Hi ive got the same problems as you, it sounds to me that your choke is the problem and your timing, for the stock carb its about 8 degrees btdc and for the motorcraft i was told is t should be between 10/ 12 degrees .

also for the right choke set up you need to check out this post, Ristow shows you how it should be done.

Motorcraft 2150 rebuild. pic heavy. - Page 2 - International Full Size Jeep Association

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