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What does water coming from exhaust pipe mean?



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Not much. When the exhaust pipe is cold, water vapor will condense as the exhaust cools on the pipe. After the pipe heats up, the vapor will not condense. Remember that the combustion of hydrocarbon fuel produces both carbon dioxide AND water vapor as a normal part of the process. All gasoline engines produce water vapor and all water vapor condenses if the exhaust pipe is cool.