jdmartin
+1y
Yeah, by "cam" he doesn't mean camshaft. Cam is just a word for a little piece of metal that an idle adjustment screw rests against. Carbuerated motors will run at a higher idle, if everything is set right, when you first set the choke - this is done by pressing the gas pedal one time all the way to the floor and releasing. Then you start the truck, usually no gas but sometimes you gotta give it a squirt. When it starts it'll idle fast, as it warms up the choke starts opening but it will still idle fast until you step on the gas to reset the idle cam. There are adjustments to control how high RPM the truck will idle when cold (fast idle) and normal, and also sometimes an additional adjustment to kick the idle a little higher when the A/C compressor kicks in.