One cylinder of the engine is flooded.

Flooding means that the spark plug electrode is covered by too much fuel in the engine cylinder, which makes the spark plug unable to ignite the mixture.

Generally, when the flooding is not very severe, unplug the fuel injector wire of the cylinder, start the engine, and step on the gas pedal to let the engine use air to discharge excess fuel.

Water entering the engine indicates that water has flowed into the cylinder, and the cylinder gasket or water jacket may be broken. There are also external factors, usually more in the rainy season, and cars pass through puddles to refuel, leading to water inflow.