What Causes the Water Sound in a Car's Exhaust Pipe?
2 Answers
The reasons for water sound in a car's exhaust pipe are: 1. The burned air-fuel mixture contains moisture, which condenses into water as it cools in the exhaust system; 2. During vehicle operation, harmful gases from combustion undergo chemical reactions in the catalytic converter, producing carbon monoxide and water; 3. Gasoline is a carbon-oxygen organic compound, and its combustion with oxygen in the air can produce water. Car exhaust pipe maintenance tips: 1. Be cautious about water exposure during rainy weather or car washing, as water entering the muffler can cause rust and affect exhaust pipe performance; 2. Perform rust prevention by removing the muffler, blocking the drain hole, and evenly adding rust-proof oil into the cylinder; 3. Maintain cleanliness by regularly cleaning the exposed exhaust pipe.
Last time I helped my neighbor fix his car, I encountered this issue - the exhaust pipe was gurgling like boiling water. Gasoline combustion naturally produces water vapor, especially during cold starts when temperature differences are large, leading to more moisture. There's a small drain hole at the tail muffler of the exhaust pipe. If it gets clogged with mud, trouble arises as accumulated water can't drain, causing the water sound. In most cases, there's no need to worry. If there's excessive water buildup, you can find a slope and rev the engine to drain it. However, if the water sound is unusually loud accompanied by white smoke, or if the car's power suddenly drops, be cautious - it might indicate a blown head gasket allowing coolant to mix in. In such cases, immediately take the car to a repair shop for inspection.
