AMC 304 Carb choices - JeepForum.com
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post #1 of 9 Old 02-17-2020, 11:48 AM Thread Starter
Rebel_Ray
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AMC 304 Carb choices

Howdy folks! I just recently got my CJ5 back from getting painted and am ready to move on to engine work. Currently the 304 under the hood has a Motorcraft 2100 with a worn out choke on it. Needless to say it runs like crap till its warmed up. Im currently a master student at Texas A&M so I wont be doing the cam and exhaust until I get my own place. I plan on changing the cam and exhaust eventually though. My question is what carb should I go with in the meantime? Im thinking just a stock replacement for my current 2100 (1.08 Venturi size I think). The Jeep is a 73 and the egr was disabled when I acquired the vehicles. What do yall think in terms of the right carb/cfm combo? Thanks!


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post #2 of 9 Old 02-17-2020, 12:03 PM
Matt1981CJ7
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If you truly do plan to upgrade the cam and exhaust at some point, you might as well upgrade to a 4-bbl intake at that time, too. In which case, I'd just throw a cheap rebuilt 2100 back on there for now, then upgrade to a 4-bbl, or FI, when you rebuild the engine.

Matt
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post #3 of 9 Old 02-17-2020, 10:30 PM
RedNeckCorvette
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I run a Holley 470 truck avenger on my 304 CJ7 easy to set up and works well on side hills, better than anything else I ran in the past on my jeep.
Many of these guys [from what I understand] like to run a 4 bbl. Rochester Quadrajet, I found them to be a pain to set up personally, but each to there own.
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post #4 of 9 Old 02-19-2020, 06:03 AM
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Quote:
Currently the 304 under the hood has a Motorcraft 2100 with a worn out choke on it. Needless to say it runs like crap till it’s warmed up.
Could simply be a choke adjustment issue. There are a TON of threads on how to do this. Might be a good, simple, cheap first step.
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post #5 of 9 Old 02-19-2020, 09:55 PM
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I was not aware the choke was very complex on the 2100. You have a hot air or electric choke can that turns when hot, which pulls the flaps open. There is a secondary vacuum pull off that works when the engine is running. Nothing complex, needs adjusting to get it to work clean.

A carb rebuild kit is $15, plus can of cleaner. This may be all you need to get it running good.
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post #6 of 9 Old 02-20-2020, 01:02 PM Thread Starter
Rebel_Ray
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From my fiddling with the carb, and I may be completely wrong here, it feels like whatever the mechanical interaction between the throttle shaft and the choke shaft has some sort of flaw in it. Like the choke wont close all the way (regardless of temp) if there is no throttle applied. I think the cams between the throttle and choke is worn or broken in some way. Not sure if that makes sense or not, what would a good resource be for me to learn more about this carb?


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post #7 of 9 Old 02-20-2020, 01:18 PM
Matt1981CJ7
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Quote:
Originally Posted by Rebel_Ray View Post
From my fiddling with the carb, and I may be completely wrong here, it feels like whatever the mechanical interaction between the throttle shaft and the choke shaft has some sort of flaw in it. Like the choke wont close all the way (regardless of temp) if there is no throttle applied. I think the cams between the throttle and choke is worn or broken in some way. Not sure if that makes sense or not, what would a good resource be for me to learn more about this carb?


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This would be a good place to start.

https://www.carburetor-parts.com/Mot...al_ep_422.html

matt


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post #8 of 9 Old 02-20-2020, 11:50 PM
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starting procedure is to stamp on throttle twice. Check the MC2100 but in most carbs this injects some fuel and puts the choke fully on and sets butterflies to fast idle. By loosening the choke can you can turn it to adjust the close of the throttle plate.

Sounds like something simple anyway.

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post #9 of 9 Old 02-21-2020, 06:07 AM
jeepdaddy2000
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Quote:
Originally Posted by Rebel_Ray View Post
From my fiddling with the carb, and I may be completely wrong here, it feels like whatever the mechanical interaction between the throttle shaft and the choke shaft has some sort of flaw in it. Like the choke wont close all the way (regardless of temp) if there is no throttle applied. I think the cams between the throttle and choke is worn or broken in some way. Not sure if that makes sense or not, what would a good resource be for me to learn more about this carb?


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The choke is mechanically held open until the throttle is pumped (how many pumps is vehicle/carb dependent).



Again there are a million writeups on how to set up the choke on this forum
https://www.jeepforum.com/forum/f8/f...5-cj5-4295521/

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