If you suspect your engine is hydrolocked, do not attempt to start it. Instead, tow it to a mechanic who can safely remove the water from the engine.
Here are the steps a mechanic will take to start a hydrolocked engine:
1. Remove the spark plugs to allow the water to escape.
2. Crank the engine over with the starter motor to expel any remaining water.
3. Install new spark plugs.
4. Add a small amount of oil to the cylinders to help lubricate the engine.
5. Attempt to start the engine.
If the engine starts, continue to run it at a high idle until it is operating smoothly. This will help to evaporate any remaining water from the engine.
