Originally Posted by showkey
I get the advance is bad and tested bad.........but...........the vacuum advance is really not a factor in cranking, at cranking speed and starting. It's vacuum supply is ported vacuum ........no ported vacuum with the throttle closed.

Good point. When cold I have to set the throttle open quite a bit to the point it runs alittle over 1k rpm once it starts. I do have the choke fully closed but move it to wide open choke once the engine starts.

With the bad vacuum advance I have to play with the choke some to keep it from dieing instead of my normal procedure of letting idle at wide open choke once it starts. In either case I let a cold engine fast idle (around 800-900 rpm for a minute or so before I drive it as it cuts down on stumbling.

I notice the performance suffering moreso than starting. Especially under load going up an incline or pulling out of a corner.


1949 Chevy 1/2-Ton 3100
1949 GMC 1/2-ton 100
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