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rotorwrench · 06-12-2021, 11:17 AM

I am only lightly familiar with the 200 cid 6-cylinder engine family but I remember that they went through several changes over the many years that it was produced. This question may fit the late V8 forum better for folks that view that section more.

I can only speak generally so I'll just impart what I can. Most automatic choke set ups on earlier cars use engine created heat to affect the metallic operating spring mechanism that opens the choke butterfly valve. Exhaust is the usual heat source. To get the exhaust to flow there may be a heat riser in the manifold system to concentrate heat where it needs to be. There can be problems with those systems. There can be heat tubes that allow hot air to travel to the control spring containment and those can get plugged up. There are sometimes vacuum ports that allow the the heated air to be drawn up to the spring containment area and those can leak or get plugged up. The linkage between the spring control and the butterfly valve can get excessively loose or seized up from crud build up.

Without knowing what year and model of vehicle, a person would be hard pressed to give accurate advice on how to approach a repair for your problem.

06-12-2021, 11:17 AM	#2
rotorwrench Senior Member Join Date: Jun 2010 Location: San Antonio, Texas Posts: 16,457	Re: %$#& autolite 1100 carb I am only lightly familiar with the 200 cid 6-cylinder engine family but I remember that they went through several changes over the many years that it was produced. This question may fit the late V8 forum better for folks that view that section more. I can only speak generally so I'll just impart what I can. Most automatic choke set ups on earlier cars use engine created heat to affect the metallic operating spring mechanism that opens the choke butterfly valve. Exhaust is the usual heat source. To get the exhaust to flow there may be a heat riser in the manifold system to concentrate heat where it needs to be. There can be problems with those systems. There can be heat tubes that allow hot air to travel to the control spring containment and those can get plugged up. There are sometimes vacuum ports that allow the the heated air to be drawn up to the spring containment area and those can leak or get plugged up. The linkage between the spring control and the butterfly valve can get excessively loose or seized up from crud build up. Without knowing what year and model of vehicle, a person would be hard pressed to give accurate advice on how to approach a repair for your problem.