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Why would my Honda Prelude only starts when its not been driven after you have it and switch off need to wait for 5 - 10 minutes start?

There could be several reasons why your Honda Prelude only starts when it hasn't been driven for a while and requires a 5-10 minute wait after being turned off. Here are a few potential causes:

1. Vapor Lock: Vapor lock occurs when fuel in the fuel lines or carburetor turns into vapor due to excessive heat. This can cause problems starting the engine because insufficient fuel reaches the engine's cylinders. Waiting for a few minutes can allow the vapor to dissipate and the fuel system to cool down, enabling a successful engine start.

2. Fuel Pressure Issues: A failing fuel pump or clogged fuel filter could cause low fuel pressure, making it challenging to start the engine. If the fuel pump takes time to build up sufficient pressure after sitting for a while, it could explain the delayed starting issue.

3. Coolant Temperature Sensor: A faulty coolant temperature sensor can send incorrect readings to the engine's computer, leading to incorrect fuel mixture calculations. This can cause starting difficulties, especially after the engine has warmed up.

4. Ignition System Issues: A weak ignition coil, faulty spark plug wires, or worn spark plugs can make it difficult for the spark to ignite the air-fuel mixture. These components can perform better after a period of rest when the engine has cooled down.

5. Fuel Injector Problems: Leaking or clogged fuel injectors can cause inconsistent fuel delivery, affecting engine starting. They may work more effectively after a cooling-off period.

To accurately identify the root cause of the problem, it's advisable to take your Honda Prelude to a qualified mechanic or auto repair shop. They can diagnose the issue and perform the necessary repairs or maintenance to ensure reliable engine starting.