1985 c10 choke stuck open it's cold and damp

fuel injectors. they are most likely pouring fuel into the cylinders instead of spraying a fine mist.

Is it black? black smoke means you are burning too much gasoline could be a bad choke or even a dirty air filter.
Blue smoke means you are burning oil out of your engine
.White means water getting into crank case or pistons.

smoking from where?, front of car, middle or tail pipe.


is this your first car, or first car and first winter (white steam?)
there are 3 kinds of smoke
black , carb flooding (ask why)
white, oil, burning, take for ever to go away
white steam, goes away fast and smells like Antifreeze, sweet and nasty.

and all carbs smoke black in the tail pipe end, when cold, unless
you very carefully tune the choke plate.
so do tell? what?

Well the choke has an electric part that heats up and makes the choke open in a few minutes. As soon as the engine starts the choke should open about 25 percent by way of a vac pull-off.
You can take the air cleaner off and watch the choke while someone starts the engine cold. If the choke does not open after it starts, check the choke pull-off. You can also open the choke with a screwdriver to see if the engine clears up.

yes you can but may cause problem with cold starts.. is the black plastic choke thermostat adjustable? if so loosen the 3 flat head screws, do not remove them,, rotate choke thermostat counter clock wise until you see the choke butter fly start to break open.. stop and turn back clockwise about 1/4 of a turn.. that should give you just enough choke to start cold engine

Coolant temperture sensor. Look at the front of the cylinder head. There will be a square 3 pin connector. This should be the one you need to replace. What happens is that it is stuck telling the computer that the coolant is cold thus providing more fuel to start. Once the system is warm this excess fuel is not needed and can create the black (raw fuel) smoke that is coming from the tail pipe once warm. This is a very simple repair. Let me know if you need anything else.

didn t say what color smoke --if you start up on cold or damp days and get a small white or steam looking discharge from tail pipe than your burning out/off the moisture that has accumulated in the exhaust system when all moisture gone smoke gone ---white alot- billowy-and doesnt stop burning coolant -water/anti-freeze-leak in coolant or the famous blown head gasket ----black smoke and not a diesel carbon build up and or need tuneup---blue smoke burning oil something in engine is damaged and allowing oil into cylinder and is being burnt

sounds like the choke is stuck closed

If the smoke comming from the tail pipe is black your running rich. If thats the case the entire fuel system has to be ckecked out. Injectors could be leaking, a bad pressure regulator,stuck return line ,a coolant temp sensor could be telling the ECU that the engines cold give her more gas. I don't recommend doing fuel service unless your qualified to do so for the obvious reasons.
If the smoke coming out of the tail is grayish you have a bad head gasket. If the smoke coming out of the tail is blue you have engine oil getting into the combustion chamber. keep me posted

You say when starting, I presume you mean when the engine is cold? Black smoke is usually a sign that the engine is burning too much fuel but when it's cold this quite normal as the choke richens the fuel/air mixture to start the cold engine.
If it's still smokey when warm then it could be numerous things from a dirty air filter to a faulty cold air sensor giving the ecu a false reading. I would have the car serviced & if no improvement then leave it into a garage with diagnostics & they should be able to where the fault lies.