Quote:

Quote:

1st... the electric choke control is an asistant to heat sooner the bimetallic coil and get iddle faster when warming from cold

2nd... being an assistant IS NOT MANDATORY to hook it up, just will take longer to get iddle, because bimetallic coil will still be heated up by the manifold heat source








Only partially correct, Keep in mind the heat riser valve on the passenger exhaust manifold was eliminated around 73’ reducing the total amount of heat at the choke well during warm-up. Using the heated divorced choke in the original factory configuration (factory carb calibration, factory intake manifold, and functioning heat crossover system) the additional heat provided by the heater was necessary to maintain the correct choke spring tension in relation to the operating temperature/ fuel mixture requirements. A prolonged fast idle also equates to a prolonged choke function, leading to an unnecessary over rich condition after engine reaches operating temp for a period of time. The controllers usually failed due to the burned contacts within, creating high resistance, stopping the full electrical flow to the heater, prolonging choke function. In the applications using the by-pass resistor, which allows for a reduced current flow to the heater (less heat) after the controller contacts have opened, additional heat was required to maintain the spring in a relaxed state at full operating temp.
Everything being original and functional, a choke heat controller is needed for the correct function of the choke system. When these cars were new, a functioning controller was MANDITORY, to meet exhaust emission standards of the day. Not to mention meeting customer fuel consumption and drivability expectations at the time.

1972 Road Runner GTX 440 6bbl 5-speed
[img]http://72rrgtx.com/carpics/bucket/DSC06730r-1.jpg[/img]