What happens if water enters the exhaust pipe?

[SanEmily]

Water entering the exhaust pipe can cause the engine to stall. Below are the relevant details: 1. Small amount of water in the exhaust pipe: The end of the exhaust pipe has a muffler, which contains a large space. If a small amount of water enters (such as from washing the car or water vapor produced by the engine), it will usually drain out through the drainage hole at the bottom. 2. Large amount of water in the exhaust pipe: If a large amount of water enters (such as from backflow during water wading or flooding when parked in a low-lying area with the engine off), it may remain in some dead corners of the muffler, eventually leading to rust and perforation. Generally, flooding is not enough to block the exhaust pipe's airflow with water pressure while the vehicle is moving. Therefore, when encountering flooded areas, the vehicle should be driven steadily in a low gear with high throttle to pass through. If driven at high speed, water splashing from the front wheels, bumper, or front grille may enter the engine compartment, wetting high-voltage wires and causing the engine to stall. Alternatively, water may surge into the air intake pipe and air filter, eventually entering the engine and causing it to stall.