I have a new AED 750 HO (Holley 4150) with electric choke. This is on a 461 Pontiac engine so it's an air gap Torker II intake, has a divorced water crossover, a blocked heat passage crossover, and I have a 1/2" wooden spacer from AED under the carb. Trust me, I need all that in the summers here, I even have to heat wrap my fuel lines lol.
I can push my gas pedal just a tiny bit and the choke flap closes. I hit the key and it she fires right up, BUT she will BARELY idle and wants to die. I have to ever so slightly add a TINY bit of gas pedal so she doesn't stall. After about a minute then the fast idle finally kicks in and the idle will increase so I can let off the pedal totally. Then once I see 100f engine temp another minute or 2 later I can romp the pedal, disengage fast idle, and drive off. Temperature is about 50f now when starting.
WHAT I'VE TRIED:
I have checked the choke pull off and it's working fine. Second the engine fires, it opens a bit. Also I know the fast idle is set when the engine is hot, which I have done per Holley to about 1,100-1,2000, I don't need it higher than that.
I called AED and they suggested I richen up 4 corner idle mixture screws 1/8 of a turn each. I did, no improvement and I had a stronger exhaust smell at idle so I went back to where I had them at max vacuum.
I seem to have the timing of the choke plate where it likes it (1-2 notches to the rich side), soon as she idles smooth at 100f I can drive off and she runs great, no stumbles, and doesn't want to die. I have noticed however that after being parked for not a long time, the stupid thing seems to close again too much. I was told buying this should fix that problem: https://www.holley.com/products/fuel...s/parts/45-267
- Where is the best place to attach that thing on the engine?
I have been adjusting the damn fast idle screw every single day for a week and I'm loosing my mind. No amount of adjustment seems to make it so she will idle on her own at cold start for the first minute until the idle finally starts to go up. I've also noticed that if adjusted too much, it will give me a false high idle when hot, so I back the fast idle back off again.
I know the damn fast idle is engaging OK and the screw is touching the plastic cam correctly because like I said, after about 45 seconds to 1 minute, she starts going up in RPM to the fast idle settings.
So, WTF lol.
What am I missing here guys? Am I just destined to have a not perfect cold start because of my engine combo maybe? I am seeing about 10.5-11 inches of vacuum at hot idle. The Torker II also runs purrs at idle when warm, you would swear it's a dual plane. Maybe tho it just hates cold winter starts?