Silent Thunder
Well-Known Member
A general engine question, I have a 64 273 V-8 non comando engine with a 4 barrel 600cfm edlebrock carburetor automatic choke. When the car is cold it idles fine, 750 rpm, when it warms up it is at 550 rpm when the needle passed the middle a little bit and the engine is fully warmed up and its say 85 degrees out the idle drops even further, 200-250 rpm and eventually drops so low it shuts off. Now I know the easy answer is adjust the idle on the carb but when I increase it for the hottest times then on the cold its 1400 rpms. My question is: Is there anything that can effect the idle speed on an engine besides the carburetor? If something is worn can it make the idle drop when warm? I want to rule everything out but the carborater. If that it all it could be I will re focus on that. I have gone to two seperate mechanics who work on carb engines (they are over 50 years old) and they have each adjusted it with the same results.