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Discussion Starter #1
Gurus-
I'm wondering if someone can help with a hot idle adjustment. My original 350/4bbl runs and drives great. New distributor and both timing and carb adjustments done by a very good mechanic. Engine runs great, revs smooth and doesn't ever choke or sputter at any rpm or load. But there is one curious behavior- once the engine is warm, the idle goes down and almost get the motor to a chug-chug sound. I'm thinking there is some type of hot idle adjustment I'm overlooking......any ideas?

Thanks!

Wm
 

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Discussion Starter #5
I'm not very good at this either, but what happens if you raise your idle speed?
It helps but the phenomenon is still there. I'm thinking there is some kind of hot choke adjustment or some other mechanical adjustment I'm not aware of. Vacuum line pressures are perfect all around, so its not the ever-annoying vacuum leak thing
 

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welcome Will
most of the carb adjustments are made when hot, except the choke..
when hot, the choke flap should be wide open,,
and choke fast idle lever [green maybe] should be all the way down,
check that if the throttle is not on the hot idle screw before it starts doing it..

could be a real small vacuum leak, after every thing gets good and hot..
if the intake has been off, check intake bolt torque.. carb bolts..
 

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Discussion Starter #7
welcome Will
most of the carb adjustments are made when hot, except the choke..
when hot, the choke flap should be wide open,,
and choke fast idle lever [green maybe] should be all the way down,
check that if the throttle is not on the hot idle screw before it starts doing it..

could be a real small vacuum leak, after every thing gets good and hot..
if the intake has been off, check intake bolt torque.. carb bolts..
JJLT1- those are excellent ideas. I’ll check those tomorrow
 
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