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Old 03-19-2011, 07:21 AM
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2100 Motorcraft Carb

Can't find the answer I need so I will start a new thread, Any help here would be great.
I have taken off the 4barrel eldebrock carb and went back to the 2100 2 barrel on my 72 Cougar 351C 2V. H code. Looking at my ford Ford car shop manual, I see that it came with the 2100D carb which looking at the photo the manual provides shows a "Choke vacuum control assembly". The carb I have does not have this. It has a place for a wire to hook to it. So it is an elect choke? But when starting, the choke opens too soon and it doesn't want to run right.
Can anyone give me advice on how to correct this??? The first photo is the one I have the second photo is from the shop manual. (if it loaded)
I will accept emails jdcron@wmis.net Thanks.[EMAIL=jdron@wmis.net[IMG]2100D Carburetor[/IMG]
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Last edited by jdcron; 03-19-2011 at 07:29 AM. Reason: To make Corrections
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Old 03-19-2011, 08:59 AM
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Yes it's electric but should run off stator voltage, the "S" terminal at the back of the alternator or on the voltage regulator. Stator voltage is less, about 9 volts IIRC.
Those carbs also had a heat tube from the manifold usually and if yours is the one poctured it has the provision for it, the tube pointing to the left in the picture and angling down. You might get by without it but you should plug it off.
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Old 03-19-2011, 06:49 PM
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2100 Carburetor

thanks for the info.
I m not aware of the s terminal, Not sure what you mean. The wire I m thinking that goes to the choke, so should this wire plug into the S terminal?
Can't find the heat tub to attach to the choke that runs to the manifold so I will plug it off.
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Old 03-20-2011, 06:37 AM
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Are you still running the stock alternator with the external regulator? The regulator should have an S terminal on it. Also the back of the alternator has the S terminal. You can splice in at either place.
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Old 03-20-2011, 06:59 AM
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2100 Motorcraft Carb

Hey thanks again Willowbilly3.
So ok I m pretty sure I know what you are saying, but I didn't mention that I have a wire coming out of my wire harness the I can plug into the choke.
So I wouldn't need to hook one up anywhere else.
The problem I believe I m having is, the choke opens to soon after start up. It doesn't want to stay running until the engine is really warmed up. Yesterday I unpluged the wire from the choke and started it and it ran without me having to give it any gas. after about 10 mins or so it ran fine. So I m thinking the electric choke sucks and I should fine myself the heat tube for my 351.
What do you think??
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Old 03-20-2011, 07:09 AM
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Haha, I have changed quite a few of the old heat tubes to electric, never the other way. You do what works though.
Is the black cover (choke thermostat) on the choke riveted on or put on with screws? You can drill out the rivets if you have to and replace them with little self tapping screws. Most of the older heat tube types had an adjustable choke 'stat. Later on they put an indexing tab in them so you couldn't adjust them. You can grind the tab off and make it adjustable if you have to. At any rate, rotating the choke 'stat will richen or lean out your choke. If you are on the proper wire and getting stator voltage, then go to the adjusting procedure. It might take a little trial and error.
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Old 03-20-2011, 07:12 AM
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Also if you have access to a volt meter, check and see what the voltage is on that wire you are plugging into the choke.
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Old 03-20-2011, 07:24 AM
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2100 Motorcraft Carb

Thanks
You know, I think I will go with your first idea and go with the s terminal.
I have nothing but time and can try different things til I get it right.
I have the screw type choke cover. So Are you saying to adjust it one way or the other so that it opens later? Or adjust it so it runs richer?
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Old 03-20-2011, 10:50 AM
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Well, kind of both. It is a bi-metal spring that winds/unwinds from heat. So if you "tighten" up the choke it will be richer and open slower.
You also have a choke break or unloader. It is what cracks the choke open a little right after the engine starts.
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Old 03-20-2011, 02:47 PM
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2100 Motorcraft Carb

Yes, I understand now. You have been a great help. Will try this sttuff and let you know.
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