Can You Drive If Water Gets into the Exhaust Pipe?

[LeWillow]

Water getting into the exhaust pipe is manageable, but you need to start the car to drain the water out. When driving in the rain or washing your car, be sure to prevent water from entering the muffler, as it can cause rust and affect the exhaust pipe's functionality. If water accidentally enters the muffler, start the engine immediately to warm up the car and expel as much water as possible from the muffler. A damaged muffler cannot reduce the engine's exhaust noise, which can exceed 100 decibels, highlighting the muffler's crucial role. While you can start the car if the exhaust pipe is submerged in water, it's not recommended. Minor water ingress will gradually be expelled with continued vehicle use and exhaust flow, without causing significant harm to the vehicle or engine.

[EvangelineLee]

Last time I drove my old off-road vehicle across a small riverbed, I encountered water entering the exhaust pipe. As long as the engine doesn't stall, bubbles gurgling in the exhaust pipe aren't a problem because the engine is still expelling gases, which can resist the water flow. Just remember to keep the throttle steady—don’t let the RPM drop. After driving out, it’s best to idle for a few minutes to let the heat evaporate any moisture. Most importantly, if the engine stalls in water, do not attempt to restart it, or water could flow back into the cylinders, hydrolocking the pistons and causing catastrophic damage—this is something my mechanic friend emphasized, as it can save thousands in repair costs. Also, it’s always good practice to check the exhaust pipe for blockages before driving.

[VonEzra]

The biggest fear when encountering flooded roads is water entering the exhaust pipe—I've learned this the hard way. There are three key points to consider: water depth (if it just reaches the lower edge of the exhaust pipe, it's generally fine), engine status (maintain steady throttle and don't lift your foot during water crossing), and stall response (never attempt to restart the engine if it stalls). Remember, as long as the engine keeps running, the exhaust pressure can prevent water ingress. After crossing, rev the engine a couple of times to expel any residual water. If white smoke appears from the exhaust, head to a repair shop immediately—it likely indicates water in the exhaust system. Even during car washes, avoid directing high-pressure water jets at the exhaust pipe.

[McLukas]

New drivers often worry about water entering the exhaust pipe, but there's no need to panic. I frequently drive on rainy mountain roads, and splashing water into the exhaust is quite common. As long as the engine is running, the exhaust pressure is sufficient to prevent water from completely backing up, and such small amounts of water won't harm the car. The real danger is stalling in deep water, as the water trapped in the exhaust pipe may flow back into the engine. Therefore, when encountering deep water, drive through slowly and steadily, and avoid braking midway. If the car stalls, do not attempt to restart it; instead, push it out or call for a tow truck. After getting the car out, don't turn off the engine immediately—let the high exhaust temperature evaporate the moisture for safety.