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What to do if an engine is locked up?

1. Check the oil level. If the oil level is low, add oil and try to start the engine. If the engine still does not start, there may be a more serious problem.

2. Check the spark plugs. If the spark plugs are fouled or worn, they may not be able to create a spark, which will prevent the engine from starting. Remove the spark plugs and inspect them. If they are dirty, clean them or replace them.

3. Check the fuel filter. If the fuel filter is clogged, it will prevent fuel from reaching the engine, which will also prevent the engine from starting. Remove the fuel filter and inspect it. If it is clogged, replace it.

4. Check the battery. If the battery is dead or weak, it will not be able to provide enough power to start the engine. Check the battery terminals and make sure they are clean and tight. If the battery is dead, jump-start the car or charge the battery.

5. Check the starter. If the starter is not working, it will not be able to turn the engine over. Try to start the engine by turning the key in the ignition. If the engine does not start, listen for the sound of the starter. If you do not hear anything, the starter may be bad.

6. If you have tried all of the above steps and the engine still does not start, you may need to take it to a mechanic for further diagnosis.

Here are some additional tips that may be helpful:

- If the engine is hot, let it cool down before attempting to start it.

- If the engine is cold, try warming it up with a heat gun or hair dryer.

- If the engine is flooded, try holding the accelerator pedal down while you crank the engine.