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EFV-8 Club Forum / General Ford Discussion / 48 engine

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Discussion Topic: 48 engine

John Lubinski

07-15-2013 @ 1:21 PM

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my 48 V8 will not idle unless I use the hand throttle. Could this be caused by the float not set properly? Just put in a rebuilt kit in it? Thanks John Lubinski

supereal

07-15-2013 @ 1:57 PM

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Adjust the idle speed with the stop screw on the throttle shaft of the carb. All your hand throttle is doing is moving that shaft, anyway. It has nothing to do with the float level. Once you get a smooth idle, turn the idle needles near the base of the carb in, one at a time slowly, until the idle starts to lope, then back the needle out about half a turn. If you have a vacuum gauge, adjust the needles for the highest vauum reading.

This message was edited by supereal on 7-15-13 @ 1:59 PM

Old Henry

07-15-2013 @ 11:29 PM

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If you don't have a 6 volt tachometer to set your idle speed at the recommended 600 RPM you can still set it right without one. Set it so a mark on the pump/generator belt goes by 25 times in 10 seconds and you have it. It's gotta be a big mark to see it. I use the Ford script on the belt. Here's a video I made demonstrating what I'm talking about:

http://www.youtube.com/watch?v=9AH08k0pvdE

Old Henry
(The older I get, the better old looks.)

TomO

07-16-2013 @ 7:43 AM

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John,

If your idle mixture screws do not affect the idle, look down the barrel of the carburetor to see if there is gasoline coming out of the nozzles. If there is, either your float is set too high or the power valve gasket is leaking.

A quick check of the float setting is to shut off the engine and remove the top of the carburetor, The gasoline level should be just below the hole in the accelerator pump housing. To check the power valve gasket, leave the car sit for one day and observe the fuel level again. It should not have changed more than 1/16",

Tom

John Lubinski

07-16-2013 @ 12:29 PM

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What causes a high pitch squarely from the arbitrator just put a rebuilt kit on the arbitrator.

supereal

07-16-2013 @ 2:29 PM

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Are you referring to the generator? I'm not familiar with the term "arbitrator" in reference to vehicles, John.

John Lubinski

07-25-2013 @ 1:59 PM

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I meant to say carburetor

Pauls39

07-25-2013 @ 7:01 PM

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John, It sounds like you may have a vacuum leak, probably at the base of the carb. This would cause a poor idle as the mixture would be too lean unless you opened the throttle a bit. The engine would then run on the mains rather than the idle jets. This would also explain the whistle you are hearing.
Inspect the base gasket and retighten the nuts evenly. You should be able to check this with a vacuum gage
Set your idle mixture screws for the highest vacumm
once you get the leak repaired.

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