What are the causes of exhaust pipe blockage?

[DelJourney]

Exhaust pipe blockage can be attributed to the following reasons: Water dripping from the exhaust pipe: When gasoline is completely burned in a car, it produces carbon dioxide and water. At high temperatures, water turns into steam, which is colorless and transparent. However, when the temperature drops below 100 degrees, the steam condenses into water. If the condensed water droplets are very small and suspended in the air, the steam appears as white gas. In cold weather, white smoke from the exhaust pipe is actually steam. If the condensed water droplets accumulate, they turn into water. Foreign objects in the exhaust pipe: Backpressure caused by the exhaust system can be intuitively understood as excessive backpressure preventing smooth exhaust flow, leading to blockage in the passage or cylinder. When exhaust cannot be discharged smoothly, the piston needs to consume more energy to push it out, increasing the overall power consumption of the engine. Additionally, due to poor exhaust flow, more exhaust gas remains in the cylinder. This exhaust gas is at a high temperature and occupies a larger volume, reducing the space available for fresh air to enter the cylinder, thereby affecting combustion.