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Youngblood · 06-21-2019, 08:17 AM

Hi; I have a 1930 town sedan running a touring motor built by Ron Kelly 3 years ago with a Snyder's high compression head. I am running a Model B Carb with a bored out Model A intake and it has run fine up to now. The car starts, idles and runs fine when cold. When the car warms up to temp (about 180 degrees at the top of the radiator) it still runs fine with plenty of power but when I let the car idle down, it runs for about 20 seconds and then starts to miss and dies.

I have checked the gas flow and it is good. I have cleaned the carb and tried a different idle jet and verified the comp jet is ok (no change). I have tried adjusting the air idle screw and think I have that set correctly. I replaced the spark plugs and they are gapped at 32. I have shot temperatures of the carb and it is about 150 degrees at the bowl. It seems that there is something wrong in the idle circuit but I can't find anything.

Can the gas be boiling at idle? Could a bad coil cause this? Any help is appreciated.

06-21-2019, 08:17 AM	#1
Youngblood Junior Member Join Date: Feb 2014 Posts: 9	Dies at idle... Help Hi; I have a 1930 town sedan running a touring motor built by Ron Kelly 3 years ago with a Snyder's high compression head. I am running a Model B Carb with a bored out Model A intake and it has run fine up to now. The car starts, idles and runs fine when cold. When the car warms up to temp (about 180 degrees at the top of the radiator) it still runs fine with plenty of power but when I let the car idle down, it runs for about 20 seconds and then starts to miss and dies. I have checked the gas flow and it is good. I have cleaned the carb and tried a different idle jet and verified the comp jet is ok (no change). I have tried adjusting the air idle screw and think I have that set correctly. I replaced the spark plugs and they are gapped at 32. I have shot temperatures of the carb and it is about 150 degrees at the bowl. It seems that there is something wrong in the idle circuit but I can't find anything. Can the gas be boiling at idle? Could a bad coil cause this? Any help is appreciated.