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Old 08-29-2013, 08:18 AM   #1
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Electric Choke

Ok everyone I never connected up the electric choke when I did my conversion to the Motorcraft carb from the Carter Carb.

In addition the plug style is different on the MC vs the Carter not a big deal I can change that.

I read something about a spring is backwards and polarity?

What the hell is all that.

Can I plug the electric choke into the MC or do I need to change something?
And if I need to change something what and how?

thanks

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Old 08-29-2013, 08:23 AM   #2
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every electric choke I ever saw just needed a wire that got hot when the ignition was turned on and a ground

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Old 08-29-2013, 10:04 AM   #3
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every electric choke I ever saw just needed a wire that got hot when the ignition was turned on and a ground
I'm not an expert but I would think this would be a bad thing. What's going to tell the choke to turn off when the engine heats up? If it has constant battery voltage with just the key on. One would think that when your running down the highway and the engine is 180+ the choke will still be on. I would hook it up with a switch so you can turn it if when its bit needed.
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Old 08-29-2013, 10:20 AM   #4
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I'm not an expert but I would think this would be a bad thing. What's going to tell the choke to turn off when the engine heats up? If it has constant battery voltage with just the key on. One would think that when your running down the highway and the engine is 180+ the choke will still be on. I would hook it up with a switch so you can turn it if when its bit needed.
that is the correct way to wire it,no switch is needed.. it turns itself off ..that is why it is automatic
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Old 08-29-2013, 10:35 AM   #5
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Ok so I do know a little about how the electric choke works from a mechanical perspective but I do not claim to be an expert at all!

So here goes the choke is basically closing the throttle linkage to provide less air more gas the electric aspect is a single electric wire that provides power as the key is turned on that allows electric current to flow to a spring in this device the spring when cold pulls the choke on providing choke to a cold engine.

As the current goes to the spring it is low voltage by the way it heats the spring the spring expands or relaxes and the choke is released if that makes any sense so constant power going down the road would mean no choke which is what we want with the choke on you are running rich.

So what Harley is saying makes perfect sense to my scattered brain

Thanks for the help everyone
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Old 08-29-2013, 11:11 AM   #6
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Originally Posted by 89Saharagreen View Post
Ok so I do know a little about how the electric choke works from a mechanical perspective but I do not claim to be an expert at all!

So here goes the choke is basically closing the throttle linkage to provide less air more gas the electric aspect is a single electric wire that provides power as the key is turned on that allows electric current to flow to a spring in this device the spring when cold pulls the choke on providing choke to a cold engine.

As the current goes to the spring it is low voltage by the way it heats the spring the spring expands or relaxes and the choke is released if that makes any sense so constant power going down the road would mean no choke which is what we want with the choke on you are running rich.

So what Harley is saying makes perfect sense to my scattered brain

Thanks for the help everyone
basically yes..the choke plate is opened and closed by a bi metal spring.when cold the spring winds one way so that it closes the choke plate which allows less air in so you get a richer mixture..the 12 volts goes to a resistor which heats up and in turn heats the bi metal spring which makes the spring wind in the other direction to open the choke plate..on most chokes the accelerator must be depressed slightly to release the choke linkage in order for it to engage or disengage
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Old 08-29-2013, 11:47 AM   #7
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Now the tricky question where can I find a plug like this
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Old 08-29-2013, 11:53 AM   #8
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probably at oreillys or where ever you shop..if you don't find one specifically like that a round quick disconnect crimp on wire end might be the right size..all the carbs I have used lately used a flat quick connect
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Old 08-29-2013, 01:06 PM   #9
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Now the tricky question where can I find a plug like this
looks like a plug for a temp sending unit on some vehicles
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Old 08-29-2013, 01:25 PM   #10
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I just fixed my choke issue on my MC2100. I tried to use the Carter choke but it did not work. I probably broke something trying to pry out the spring to reverse it. I ended up ordering a new choke from Mike's carburetor parts for about $23 and it fixed the hard start problem I was having. If that's the stock harness I can dig through my loom and help you find the right wire.
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Old 08-29-2013, 02:55 PM   #11
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Quote:
Originally Posted by 89Saharagreen View Post
Ok so I do know a little about how the electric choke works from a mechanical perspective but I do not claim to be an expert at all!

So here goes the choke is basically closing the throttle linkage to provide less air more gas the electric aspect is a single electric wire that provides power as the key is turned on that allows electric current to flow to a spring in this device the spring when cold pulls the choke on providing choke to a cold engine.

As the current goes to the spring it is low voltage by the way it heats the spring the spring expands or relaxes and the choke is released if that makes any sense so constant power going down the road would mean no choke which is what we want with the choke on you are running rich.

So what Harley is saying makes perfect sense to my scattered brain

Thanks for the help everyone
Gotta love this forum, thanks this makes sense to me now. I was thinking it worked a little different. Today is a good day I learned something new!

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