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Old Dec 16, 2025 | 12:59 AM
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saauvenshine's Avatar
saauvenshine
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Carb Question

Have a Holley 94 carb on my 54 truck 239 ohv that I rebuilt. Truck starts but the fuel and air mixtures screws are not working. I can run them all the way in, and truck still runs when it should die. I know idle should decrease as they are turned in but it doesn't have any effect. Any thoughts? Have tried removing screw and blowing air in holes but no change.
 
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Old Dec 16, 2025 | 06:34 AM
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It could mean the idle circuit is being bypassed. Throttle plate not closed? Idle screw not adjusted correctly? Power valve circuit engaged/leaking?
 
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Old Dec 16, 2025 | 08:08 AM
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Vacuum leaks?

Really check for vacuum leaks also. Lines and carb base gaskets, etc.
 
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Old Dec 16, 2025 | 10:08 AM
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Originally Posted by saauvenshine
Have a Holley 94 carb on my 54 truck 239 ohv that I rebuilt. Truck starts but the fuel and air mixtures screws are not working. I can run them all the way in, and truck still runs when it should die. I know idle should decrease as they are turned in but it doesn't have any effect. Any thoughts? Have tried removing screw and blowing air in holes but no change.
I had the very same issue. When I reassembled the carb I inadvertently placed the float tab on the wrong side of the spring. Other than running a little rich the truck ran fine. I knew that if I couldn't lean it until it stalled there was something wrong. Easy fix.
 
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