2150 Choke Adjustment
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Senior User
Joined: Mar 2002
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From: PA
2150 Choke Adjustment
Anyone have a good procedure for setting the choke on Motorcraft 2150 carb? I tried following the procedure from the Jeep site,
https://www.ford-trucks.com/framered...uel/2150.shtml
but have problems. The part that doesn't make sense to me is rotating the choke spring 90 degrees rich, when I do that the choke plate stays open too far no matter how much I turn the adjusting screws. I made the adjustments with the choke spring in the normal position and engine running, it works better but think it needs some fine tuning. When I start it cold it usually stalls after a few seconds. On second attempt it usually keeps running. This carb has the hot air and electric assist choke. I know I have a leak in the hot air tube, I haven't been able to find a replacement yet. I don't know if the air leak is causing this or if my adjustment is still off.
https://www.ford-trucks.com/framered...uel/2150.shtml
but have problems. The part that doesn't make sense to me is rotating the choke spring 90 degrees rich, when I do that the choke plate stays open too far no matter how much I turn the adjusting screws. I made the adjustments with the choke spring in the normal position and engine running, it works better but think it needs some fine tuning. When I start it cold it usually stalls after a few seconds. On second attempt it usually keeps running. This carb has the hot air and electric assist choke. I know I have a leak in the hot air tube, I haven't been able to find a replacement yet. I don't know if the air leak is causing this or if my adjustment is still off.
Posting Guru
Joined: Aug 2000
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From: (near) Denver USA
You need to have the choke closed as far as it will go to properly set fast-idle cam engagement, choke pull-down clearance, and choke unloader clearance.
If the temperature is very warm around the carb (or the bimetallic spring is weak), you may need to turn the thermostat farther than 90 degrees to completely close the choke.
Are you sure you rotated the choke thermostat toward rich and not lean? Baxter's explanation is somewhat unclear. To turn the thermostat toward rich, you need to turn it counter-clockwise, as you face it from the right side of the carb. The choke plate should start closing immediately when you turn the thermostat toward rich.
I don't think your start-up problem is related to the hot air tube. I think it's the pull-down adjustment, or maybe a defective pull-down diaphragm. It could also be the fast-idle speed adjustment.
Some choke hot air tubes are still available from Ford dealers as Motorcraft parts. A leak in the hot air tube could make the choke take longer to release when the engine warms up.
If the temperature is very warm around the carb (or the bimetallic spring is weak), you may need to turn the thermostat farther than 90 degrees to completely close the choke.
Are you sure you rotated the choke thermostat toward rich and not lean? Baxter's explanation is somewhat unclear. To turn the thermostat toward rich, you need to turn it counter-clockwise, as you face it from the right side of the carb. The choke plate should start closing immediately when you turn the thermostat toward rich.
I don't think your start-up problem is related to the hot air tube. I think it's the pull-down adjustment, or maybe a defective pull-down diaphragm. It could also be the fast-idle speed adjustment.
Some choke hot air tubes are still available from Ford dealers as Motorcraft parts. A leak in the hot air tube could make the choke take longer to release when the engine warms up.
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Senior User
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From: PA
OK now I feel stupid...Bubba your right, I was turning 90 degrees lean (clockwise), something about the diagram in the rebuild kit made it look like clockwise to me. I'll readjust and see how it runs. Thanks!
Cross-Country
Joined: Feb 2013
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I have a question...im sorry to cut in but i have no clue how to post on this forum. I have a 1978 Ford F250 with a 351 and a Motorcraft 2150 carb. Runs nice but here on top of a mountain, at 19 degrees (or less. Brr Arctic evil weather) it won't start. The choke is closed so much that absolutely no air can get in. Where would u usually set a choke in order to start this puppy at altitude and freezing cold? He's been very unhappy lately 😕
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Joined: Feb 2014
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The choke should close all the way at that temp. The choke pull off should open it slightly as soon as it starts. Then the electric choke should start to open after a minute or so.
This is what I do. Right or wrong it works for me.
Tap the accelator so that the choke closes. Before you start it. Dis connect the wire going to the choke.
Check to see if the fast idel is set. If so start the truck and see if the choke opens up a little bit. Mine set at 7/32 of a inch.
If the choke pull off is working. Then shut the vechile off connect the choke wire. Restart the vechile and see if the choke opens after a minute or so.
The spring inside can go bad. And it will take a long time to open or will not open at all. But it will still close.
This is what I do. Right or wrong it works for me.
Tap the accelator so that the choke closes. Before you start it. Dis connect the wire going to the choke.
Check to see if the fast idel is set. If so start the truck and see if the choke opens up a little bit. Mine set at 7/32 of a inch.
If the choke pull off is working. Then shut the vechile off connect the choke wire. Restart the vechile and see if the choke opens after a minute or so.
The spring inside can go bad. And it will take a long time to open or will not open at all. But it will still close.
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2150, 351c, adjustment, auto, carburetor, choke, clearance, closed, ford, motorcraft, pulldown, replacement, setting, settings, thermostat, tube
