Rich Fuel Mixture ?
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New User
Joined: Mar 2003
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Rich Fuel Mixture ?
Ok I want to start driving my 74 F100 4X4 more.
But, it leaves a large soot and cloud of black smoke when it starts.
It slugs between gears 1st - 2nd - 3rd.
I have to clutch and rev then reshift. Runs great once it is warms. Except for the fact that it gets 10MPG 2WD and 4WD. Carburetor has been questionable since I first owned it.
The fastening bracket attaching the air cleaner is trash and the bolts that hold it in place are stripped.
It leaks a lot of un-clean air into the carb. I have been told that it is probably running EXTREMELY rich and that I should probably start with replacing the carburetor before I go through a full rebuild.
What are your thoughts?
Thread edited for the Title for ease of searching
But, it leaves a large soot and cloud of black smoke when it starts.
It slugs between gears 1st - 2nd - 3rd.
I have to clutch and rev then reshift. Runs great once it is warms. Except for the fact that it gets 10MPG 2WD and 4WD. Carburetor has been questionable since I first owned it.
The fastening bracket attaching the air cleaner is trash and the bolts that hold it in place are stripped.
It leaks a lot of un-clean air into the carb. I have been told that it is probably running EXTREMELY rich and that I should probably start with replacing the carburetor before I go through a full rebuild.
What are your thoughts?
Thread edited for the Title for ease of searching
Posting Legend
Joined: Sep 2001
Posts: 30,255
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Rich Fuel Mixture ?
Hello-
Welcome to Ford Truck Enthusiasts! The Internet's leading Ford TRUCK and SUV Resource!
Check your choke for proper operation b4 you do any replacing. Get the air cleaner assy fixed or find a used one at the junkyard.
Are you asking if you need to rebuild the engine?
What engine and carb do you have?
What is "slugs"???
Welcome to Ford Truck Enthusiasts! The Internet's leading Ford TRUCK and SUV Resource!
Check your choke for proper operation b4 you do any replacing. Get the air cleaner assy fixed or find a used one at the junkyard.
Are you asking if you need to rebuild the engine?
What engine and carb do you have?
What is "slugs"???
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Rich Fuel Mixture ?
Excellent thoughts, but I have no answers... I need to look up the engine number. It is a standard 74 300 six. one barrel ford carburator. The actual air cleaner assembly is fine but needs a screw through the top into the top of the carburator to hold it on. the piece the crosses over the tob of the carburator and has the hole in it for the screw is broken and will not hold the air cleaner onto the carb tight. Also today found the the rich lean screw is stripped.
Sorry I was tired... "Slugs down" is actually supposed to be "bogs down"
And yes I guess that part of the question is does it need a rebuild. It runs fine after it really warms up 20- 30mins of running.
I was told to try and address the Carb problem first then worry about rebuilding if it doesn't get better. kinda the $200 jump before the big $400+ jump
Sorry I was tired... "Slugs down" is actually supposed to be "bogs down"
And yes I guess that part of the question is does it need a rebuild. It runs fine after it really warms up 20- 30mins of running.
I was told to try and address the Carb problem first then worry about rebuilding if it doesn't get better. kinda the $200 jump before the big $400+ jump
Posting Guru
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Rich Fuel Mixture ?
Welcome to the site, TR. If the engine runs OK after it warms up, don't rebuild it yet. Once you get the carb and tuning right, you'll be surprised how good it will run.
The bogging is probably caused by a faulty accellerator pump in the carb. If it were mine, I would just buy a rebuilt carb, instead of trying to rebuild the old one. With a "new" carb and a little tuning, it should be good for many more miles.
The bogging is probably caused by a faulty accellerator pump in the carb. If it were mine, I would just buy a rebuilt carb, instead of trying to rebuild the old one. With a "new" carb and a little tuning, it should be good for many more miles.
Junior User
Joined: Sep 2002
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From: Mpls US
Rich Fuel Mixture ?
Hey tell ya what, that carb is EEEz to rebuild and the kit's about $8.00--just make sure you get a new float as well and be accurate with the valve tab and definately adjust that CHOKE! That will do it everytime...
Elder User
Joined: Oct 2002
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From: Seattle/Tacoma Washington U.S.A.
Rich Fuel Mixture ?
Do you have a vacuum guage? If you dont, find somone who does or buy one. If you rebuild the carb and fix the striped threads on the fuel screw, and still have problems, I would test the vacuum on your intake, it might be leaking air... Thats all I got for now. Buy a Rebuilt carb (the one you have might need rebuilding but the rebuilt ones I have seen come with a (if it dont work bring it back for a refund). and if you want more power and dont care too much for gas mileage (I had a stock 2bbl carb on and put on a edl 4bbl and get 3 mpg better, and the Air/Fuel is not set right, runs ritch) so if you want you can spend about 250$ on a low CFM carb. Hope my ideas help.
Posting Guru
Joined: Aug 2002
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From: Minneapolis, MN
Rich Fuel Mixture ?
I agree with Eric. Check the choke first and hit the junkyard for an air cleaner. You might want to douse the carb down with a can of carb cleaner. Those 1 barrels are pretty simple and easy to fix.
Just my 2¢
Greg
Just my 2¢
Greg
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Posting Guru
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From: Minneapolis, MN
Rich Fuel Mixture ?
Originally posted by Racerdave
Do you have a vacuum guage? If you dont, find somone who does or buy one. If you rebuild the carb and fix the striped threads on the fuel screw, and still have problems, I would test the vacuum on your intake, it might be leaking air... Thats all I got for now. Buy a Rebuilt carb (the one you have might need rebuilding but the rebuilt ones I have seen come with a (if it dont work bring it back for a refund). and if you want more power and dont care too much for gas mileage (I had a stock 2bbl carb on and put on a edl 4bbl and get 3 mpg better, and the Air/Fuel is not set right, runs ritch) so if you want you can spend about 250$ on a low CFM carb. Hope my ideas help.
Do you have a vacuum guage? If you dont, find somone who does or buy one. If you rebuild the carb and fix the striped threads on the fuel screw, and still have problems, I would test the vacuum on your intake, it might be leaking air... Thats all I got for now. Buy a Rebuilt carb (the one you have might need rebuilding but the rebuilt ones I have seen come with a (if it dont work bring it back for a refund). and if you want more power and dont care too much for gas mileage (I had a stock 2bbl carb on and put on a edl 4bbl and get 3 mpg better, and the Air/Fuel is not set right, runs ritch) so if you want you can spend about 250$ on a low CFM carb. Hope my ideas help.
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Postmaster
Joined: Apr 2000
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From: SD
Rich Fuel Mixture ?
If the idle mix screw is stripped and the air cleaner bracket on carb can't be repaired then you need a 'new' carb. Either look into buying a rebuilt one, or find a used one from a salvage yard and rebuild it yourself. I wouldn't bother rebuilding your current one if some parts of it are unrepairable.
Just a thought...
Marty
Just a thought...
Marty