Fast idle

[moparstables]

What would be the correct rpm when the carb is on the high side of the fast idle cam?

 

[moparleo]

Year/engine size/carb type/at or stick/ ac/? etc.... More info needed.

 

[moparstables]

Year/engine size/carb type/at or stick/ ac/? etc.... More info needed.

I have a 440 bored 40 over four speed with a holley 850 double pumper with an electric choke non ac

 

[moparleo]

Depending on other variables like cam grind........... What are you looking for exactly ? High idle is not as important as the standard idle speed which for a stock engine would be in the 650 - 850 range

 

[moparstables]

Depending on other variables like cam grind........... What are you looking for exactly ? High idle is not as important as the standard idle speed which for a stock engine would be in the 650 - 850 range

The problem I am having is that when I get the car started and warmed up sometimes it wants to idle at 1500 rpm then other times it idles at 1000. I am thinking that it might be idling off of the fast idle cam. It is hard to see the fast idle screw to know if the cam is all the way off of that screw. I had the same problem with the old motor. This is a new motor and I put on a new performer intake.

 

[moparleo]

With the engine not being stock, there is no right answer to your question. How is the idle speed when warmed up ? Is it steady ? The engine should idle with the butterflies almost closed.

 

[moparstables]

With the engine not being stock, there is no right answer to your question. How is the idle speed when warmed up ? Is it steady ? The engine should idle with the butterflies almost closed.

It idles fine sometimes then other times it idles fast but also sometimes if I tap the foot feed it will idle down and sometimes I have to let out on the clutch a little to pull the motor down to idle then it will stay at the correct idle rpm.

 

[moparleo]

It sounds like the throttle linkage or cable are binding, Also could be a weak throttle spring or incorrect spring attachment. Check to make sure that the throttle opens fully when the pedal is down and that it closes completely when the throttle is released. first. Just have someone inside the car operate the gas pedal while you watch from under the hood. The engine does not need to be runnung to do this. OK here is an article on tuning. There is a procedure to set timing and carb . It is the same for any make of engine. Timing is always first and then carb adjustments.

Tuning Tips

 

[moparstables]

OK here is an article on tuning. There is a procedure to set timing and carb . It is the same for any make of engine. Timing is always first and then carb adjustments.

Tuning Tips

Thanks I will read this and try it.