1. Spark plug wires: The spark plug wires can become wet when it rains, causing the engine to misfire. Ensure the spark plug wires are well-insulated and protected from moisture.
2. Distributor cap and rotor: The distributor cap and rotor are also vulnerable to moisture. If they are wet, the engine can misfire or stall. Ensure these parts are dry and clean.
3. Fuel injector O-rings: The fuel injector O-rings can become damaged or brittle over time, allowing fuel to leak. This can cause the engine to run poorly or stall. Replace the fuel injector O-rings if they are worn or damaged.
4. Ignition coil: The ignition coil can also be affected by moisture. If it is wet or damaged, the engine can misfire or stall. Ensure that the ignition coil is dry and undamaged.
5. Battery: Your car uses electricity from the battery to start, if it is low on charge it will not have the necessary power to start the car. Check your battery and make sure it has sufficient power to start the car.
6. Fuel pump: The fuel pump is responsible for delivering fuel to the engine. Ensure that the fuel pump is working correctly and is not obstructed.
If you have checked all of these possible causes and your Honda Civic still won't start, you must take it to a qualified mechanic for diagnosis and repair.