White smoke indicates moisture in the exhaust gases. (Cold
engine/environment or coolant leaking into cylinders)
Black Smoke indicates unburnt fuel in exhaust gases. (Mixture too rich
or ignition problem).
Blue Smoke indicates oil in the exhaust gases. (Worn engine).
Does the engine smoke white when it is at normal temperature, say after
5 minutes running? If so you may have a coolant leak internal to the
engine. Check your coolant level and the oil filler cap for any white
frothy deposits. If both check out normal, it may just be cool air
causing condensation, is it still cold where you live?
If there is low coolant or white froth under oil filler cap then you may
be looking at a head gasket issue, get the coolant system pressure
tested to confirm or deny a head gasket leak.
If all looks normal, does the engine reach a normal temperature or does
the temp guage read cold all the time? If the engine fails to warm up to
normal the thermostat may be stuck open. An overcooled engine may
produce visible water in the exhaust gases.
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