| | Re: '84 choke
Inside the cover there is a thermostatic(heat sensitive) coil spring, the electric heater warms the spring, it in turn expands to pull the choke open. Before replacing the choke assembly, get a manual with the specs to set the choke and the proper tools/gauges if required to set it up. In the past, I used to change the thermostatic choke for a cable operated manual one whenever I had issues with thermostatic one acting up. Another thing make sure the carb and it's linkages are clean, otherwise they won't work properly.
2009 Ranger Sport 4.0L 5 Spd 3.55:1 Bone Stock