Why does my 1975 Jeep Cj spew white smoke from it's exhaust?

Looks fun. If you have smoke coming from the exhaust it could be one of three problems. First, if it is black smoke that would indicate too much fuel. Possible cause-carburetor. Second, if the smoke is white possible cause is water or coolant in the system. Possible head gaskets . Third, if blue smoke,excessive oil usage.

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no clues as to what the smoke is.
or where it emits from. (tail pipe end)
white smoke or black
black is rich running.
white can be burning oil and smells like burning oil (lingers)
white can be steam,aka, antifeezes burning, goes the vapors dont linger like oil smoke does and smells sweet, unlike oil smoke.

EVAP is only FUEL vent , fumes. gas fumes.
there are lots of vacuum lines
to engine
evap
brake booster
the engine hood sticker covers the majors, (smog related, )

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If it is the v8, the most common cause for greyish, white smoke is bad valve stem seals. True white smoke smells very sweet and is caused from coolant being buring in the combustion chamber.

Are you losing oil or coolant?

White smoke means that coolant is entering the exhaust system this indicates a internal engine failure

I would follow the big rad hose at the top to the thermostat and see if the water is comming from there you might also want to check you oil for water/coolant, white pillows of smoke comming out of the exhaust pipe as well the smell of exhaust comming from rad ( those are some signs of a blowen head gasket )

Good Luck!

You got a coolant leak, from a head gasket or intake manifold,if white smoke comes out the exhaust.
No lock on rad cap. Push down and turn

White smoke is a sign of coolant being burned in the exhaust.

Is your coolant level dropping w/ no apparent leaks? White smoke from the exhaust indicates a bad head gasket, and loss of coolant would confirm this.

Hello;
Volumes of white smoke is an indication of water in the exhaust. A certain amount of vapor will be present on start up, but if it is different than what has been the norm for this vehicle then a check of the cooling system is in order.
Rich
RPM Northwest