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In a gasoline fueled engine, blue smoke is a sign of oil being burned with the gasoline. This could be from rings allowing too much oil by the piston, a leaking valve guide or even oil being mixed into the gasoline. Two cycle engines, which have oil mixed in with the fuel on purpose, will often produce this light blue smoke at the exhaust. This would be a natural condition.
yes
Find and fix exhaust leak
what kind of gasoline are you running? and what color is the smoke?
In most cases white smoke means you are burning gasoline inefficiently, black and gray are usually oil, however, that's the extent of my knowledge.
Burning oil
Could be a diesel? If not then replace your oxygen sensor on your exhaust. A bad oxygen sensor causes the exhaust smoke to be dark in color.
The white smoke is water left in the muffler, it is drawn in when engine is shut off. It smell like gasoline, because the engine is burning one third of the gas, and discharging the rest with exhaust. http://www.autozone.com/servlet/UiBroker?UseCase=S001&UserAction=viewSimpleDiagInfo&Parameters=info
what might cause black smoke from exhaust and a bad smell from a 94 ford explorer
White, water vapor. Gray/black unburned gasoline. Blueish, burning oil.
if it is white smoke engine need to rebuilt.
White smoke means head gasket, cracked head or equivelant.