Under what circumstances can the engine be restarted after water ingress?

[LolaMarie]

Engine cannot be restarted after water ingress. When a vehicle wades through water, water enters the cylinders through the intake manifold. Due to the incompressibility of water, the piston stroke will become shorter, leading to bending or breaking of the engine connecting rod. Under extreme conditions, the broken connecting rod may fly out and penetrate the cylinder block. Here are additional details: Reasons for engine stalling in water: After the distributor cap gets wet, it loses its normal ignition function. The engine air filter element becomes soaked, increasing intake resistance and allowing water to enter the combustion chamber, making it impossible for the spark plug to ignite. High risk of hydro-lock: Restarting the engine at this time can easily cause hydro-lock. If the engine remains submerged in water for an extended period, the situation becomes extremely serious. Rainwater contains various impurities, sediment, and acidic substances that are highly corrosive. This causes significant corrosion to electronic systems, such as: Short circuits in the ECU's internal IC circuit board, rust spots on connector terminals, rusting of metal parts, poor circuit contact, ultimately leading to short circuits and burnout.