Hello, I recently installed a edelbrock 600cfm on my stock chevy 305. I cant seem to get the choke to keep it running when cold whether I adjust the choke to rich or lean. Does that mean the carb is too rich for my 305? Thanks, Greg M

Can’t speak to that carb model, but on my truck’s autolite 2100 the choke plate is fully closed before starting the engine , then slightly open when the engine starts up and is cold idling. I’m guessing it is open about 1/10 to 2/10 of an inch. Don’t have the specs in front of me, but the specs sa…

Its completely shut when cold but the edelbrock is a little different than an autolite. It actually has a air passage hole on top of the choke plate. Its an Edelbrock 1405 thats converted from manual to electric choke.

You’ve gone above my carb pay grade I’m afraid. Hopefully somebody here has some direct experience w/that model of carb. What if you experimented with manually opening the choke plate at various amounts while cold idling to see if that helped? I seem to recall Ray suggesting to a caller with t…

The carburetor is fine for a 305 so that’s not the issue. I assume you mean the engine is stumbling bad and/or trying to die upon cold startup? The reason why could be due to the fact that the carburetor does NOT have a choke pull-off diaphragm. Unfortunately, that’s the way they’re made so it tak…

The choke blade does open about that far after the engine runs for about 10 seconds and then dies. Then I have to pump the gas alot to get it to stay running. George may be onto something when he mentioned idle mixture.

Is it on the fast idle cam?![IMG_0650|690x366](upload://2j37V Photo is a Weber, the Edelbrock may be different but similar. oAV6Yp99YjGZyrljgy2UD6.JPG)[IMG_0649]

That looks the same as my carb. Ill check the position of the cam tomorrow when its cold.

How does the truck run after it is warmed up? The fact that you have to use the accelerator pump to keep it running makes me think it is not too rich. If it was my truck I would convert it back to manual choke. I never liked automatic chokes anyway.

It runs and idles perfect when warm. Secondaries operate like they should. Its just a bear to start.

Choke adjust edelbrock 600cfm

Maintenance/Repairs

George_San_Jose1 November 17, 2017, 4:42am 8

That’s pretty much exactly how the 2100 works. On the 2100 there’s one other adjustment not shown in that image that controls the choke plate angle vs the cam angle.

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Choke adjust edelbrock 600cfm

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