How to Determine if a Car Has Taken in Water

[AnaLee]

Check if the engine oil color appears abnormal. Inspect the air filter and the lower housing of the air filter one by one for obvious signs of water ingress, and check the intake pipe and intake manifold for clear traces of water passage. Remove the spark plugs of each cylinder and check if they are damp. If damp, it indicates signs of water entering the engine. When the engine is operating normally, the position where each cylinder's piston reaches top dead center is the same, and the top dead center position on the cylinder wall is clear.