Why Does the Engine Sound Louder After Water Intake?

[Cassidy]

Here are the reasons why the engine sounds louder after water intake: Not Started: The vehicle was submerged in water causing the engine to take in water, and more critically, the engine was not started until the vehicle was towed to the repair shop, leading to a louder engine sound due to water intake. Restarted: The vehicle was driven in water, causing the engine to stall due to water intake. Upon restarting, the engine sound became louder. Engine Started: After the engine took in water (a small amount that does not prevent the engine from starting), the owner unknowingly started the engine and drove for some distance, resulting in a louder engine sound.

[DeAriel]

After water enters the engine, the sound becomes louder. This reminds me of a rescue experience where water got into the cylinders. Since water cannot be compressed, when you start the engine, the piston encounters tremendous resistance, producing loud knocking or detonation sounds. Over time, this can damage the connecting rods or crankshaft, leading to more severe consequences. For example, last time a car owner started the vehicle after heavy rain, and there was a loud noise. After towing it to the shop for inspection, we found water accumulation in the cylinders. My suggestion is that if you encounter such a situation, immediately turn off the engine and do not restart it. Tow it to a professional repair shop where they can use instruments to drain the water and assess the damage. Preventive measures include avoiding driving through waterlogged areas during rain and regularly checking the sealing of the intake system.