Need help with Holley!!!

[gtscode]

I need some help adjusting the fast idle circuit of my Holley. It's an original 4150 completely rebuilt but the fast idle circuit is just too high and doesn't always come off when I blip the throttle.

It is running a hot air choke which comes of the manifold.

How do I even begin to adjust it? I am pretty lost when it comes to adjusting carbs.

Thanks!!!

 

[blue65coupe]

I had a Holley once. 'Cept she was a 36D and not a 4150. The fast idle on her was never really too high. Always at a pretty good pace as long as you kept the "throttle blipped". Now, she was certainly full of hot air but man, could she fold. Adjustment was pretty easy as long as you knew how to feather the inlet and tweak the dials.

 

[lethal289]

I had a Holley once. 'Cept she was a 36D and not a 4150. The fast idle on her was never really too high. Always at a pretty good pace as long as you kept the "throttle blipped". Now, she was certainly full of hot air but man, could she fold. Adjustment was pretty easy as long as you knew how to feather the inlet and tweak the dials.

:rofl :craz Now thats some funny chit. Sorry i cant help, i've only messed with edelbrocks.

 

[AzPete]

If the choke is opening and closing at the correct time, then you need to adjust the idle speed screw that is on the choke side of the carb. It is sometimes very hard to see. Look from the back and down low to see it. If not opening/closing proper, then there should be three screws on the edge of the plastic cup on the passenger side. Loosen them a bit and rotate the cup so it opens the choke just a small bit.

 

[tarafied1]

I think Pete hit the nail on the head. As he said there is a "fast idle" cam on the choke and a srew to adjust idle speed for when the choke is on. It should be a stepped cam so that idle comes down a little when partially open and normal when all the way open. It sounds like what you are describing also is an inconsistant choke action since you said

fast idle circuit is just too high and doesn't always come off when I blip the throttle.

The "cup" has a bi-metal spring that coils up when hot because the two metals expand and contract at different rates. Using hot air to heat the spring requires the choke to seal good and the tube to flow good and so on. You may have some issues there if the choke doesn't "always" open. Converting to an electric choke is very easy and would be more reliable.