1979 Models

With engine cold and ignition off, pull out fully on choke knob and release. Knob should return automatically and freely. Connect a tachometer to engine.
On California vehicles, start engine with choke knob pulled fully outward. Knob should return halfway automatically within 20-70 seconds after starting. Set engine speed at 2000 RPM with choke knob. Let engine run and when temperature gauge reaches range choke knob should automatically return completely inward. See Figure.
On California vehicles, stop engine. Pull choke knob fully outward with ignition switch on. Choke knob should be held in this position (should not return).