Carb mixture screw problems
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Mountain Pass
Joined: Dec 2020
Posts: 100
Likes: 6
From: Winston-Salem, NC
Carb mixture screw problems
Just something I discovered on my Motorcraft 2150. One of the mixture screws is way off than the other one. The way my pa showed me to adjust carbs is to start at the same, and adjust one independently to highest vacuum and go to the second screw, and go back in forth once or twice. The left mixture screw is more or less “normal” but the right side one is basically all the way lean, so much so that its difficult to turn the screw. Even if I back the right one off, and turn the left one in, vacuum goes to hell and the engine stumbles. Essentially highest vacuum is when the screws are drastically apart. Any idea what is going on and how to fix it?
Lead Driver
Joined: Nov 2006
Posts: 5,217
Likes: 506
From: Pa.
Try replacing the idle mixture screw. There are more than one part numbers for these carburetors. My guess is one got replaced with the wrong screw so match with the known good one. Also the aluminum body carb threads do where out. It can be repaired but that repair is best done by a professional.
Examples on the screw with varying spec.s
Here and Here .. Measure the known good one carefully and then replace them both and throw away the bad so you never get it mixed up again .
Here is a great resource for getting your 2150 carb right.
Examples on the screw with varying spec.s
Here and Here .. Measure the known good one carefully and then replace them both and throw away the bad so you never get it mixed up again .
Here is a great resource for getting your 2150 carb right.
Thread Starter
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Mountain Pass
Joined: Dec 2020
Posts: 100
Likes: 6
From: Winston-Salem, NC
Earlier today I took out the bad one and sprayed the inside if the hole with BPC, as a friend told me to do. It didnt help any. I do remember the bad screw looked like the one from the second link. Ill check the good one when I get home. When I got the truck it had, and still does, a 2150 from Uremco that was remanned in 2018. Do you think it would be good to throw a rebuild kit at it? I dont really want to because its one more thing that I could mess up. But if you think it would be beneficial I would do it.
Lead Driver
Joined: Nov 2006
Posts: 5,217
Likes: 506
From: Pa.
Earlier today I took out the bad one and sprayed the inside if the hole with BPC, as a friend told me to do. It didnt help any. I do remember the bad screw looked like the one from the second link. Ill check the good one when I get home. When I got the truck it had, and still does, a 2150 from Uremco that was remanned in 2018. Do you think it would be good to throw a rebuild kit at it? I dont really want to because its one more thing that I could mess up. But if you think it would be beneficial I would do it.
Lead Driver
Joined: Nov 2006
Posts: 5,217
Likes: 506
From: Pa.
Then the carb body thread hole is worn out or dirty. Chances are the throtle body shaft holes are worn too. You'll never get this carb to Idle smoothly at idle until it's repaired.
This shows the process for the throttle shaft repair.
This shows the process for the throttle shaft repair.
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