What Causes the Engine Sound to Change After a Vehicle Has Driven Through Water?
2 Answers
It may be related to water entering the bearings of the engine belt and the wheel bearings. Below is relevant information about driving through water: Introduction to driving through water: As the name suggests, it refers to a vehicle traveling on low-lying, waterlogged roads, passing through water. This generally occurs during rainy weather, in low-lying areas where inadequate drainage leads to water accumulation on the road. Precautions for driving through water: Before entering water, observe the road conditions carefully; maintain steady power while in the water; after driving through water, inspect the electrical system. If a car stalls in water, the main reason is usually water entering the exhaust pipe, though in some cases, electrical damage may also occur. Once a car stalls in water, do not attempt to restart the engine, as this could lead to water entering the intake manifold and damaging the valves, with severe cases potentially resulting in engine failure. Instead, the vehicle should be towed to a 4S shop immediately for professional handling.
Last time after I drove through standing water, the engine started making strange noises, like gurgling or slight trembling. This is usually because water has seeped into the intake system or cylinders, causing uneven combustion. Uneven combustion can make the engine run abnormally. It could be that the air filter got soaked and clogged, blocking airflow; or the spark plugs got wet, affecting ignition. If sparks don't occur on time, the engine struggles to run, changing the sound. After driving through water, you should stop immediately to check—don't force it to keep going. Otherwise, if too much water enters the cylinders, it can cause hydrolock, potentially damaging pistons or connecting rods, which would be expensive to repair. I recommend turning off the engine, opening the hood to check for water traces or unusual smells, then finding a professional mechanic as soon as possible to inspect wiring and fuel lines with proper tools to prevent more serious issues. Generally, avoid driving through deep water, and when you must, slow down to minimize splashing.
