Why is it difficult to start the car in hot weather?

[DeKing]

Hot weather makes it difficult to start the car mainly because the engine's air-fuel mixture is not properly matched, resulting in a mixture that is either too rich or too lean. Common causes include the following situations: 1. The fuel evaporation system is used to collect fuel vapor from the fuel tank. The fuel vapor is then introduced into the cylinder at the appropriate time to participate in combustion, thereby preventing the fuel vapor from being directly discharged into the atmosphere and causing pollution. Common issues are caused by the fuel evaporation solenoid valve or activated charcoal canister; 2. Failure of the fuel supply system. For example, poor performance of the fuel pump, clogged filter, or dirty fuel injectors; 3. Failure of the ignition system. For example, poor ignition performance of spark plugs or damaged ignition coils; 4. Sensor problems. For example, issues with the water temperature sensor, camshaft position sensor, oxygen sensor, etc.