What are the reasons for difficulty starting even after replacing the new battery?

[DiGavin]

The reasons for difficulty starting even after replacing the new battery are: 1. The cold start injector is not spraying fuel; 2. Faulty coolant temperature sensor; 3. Faulty intake sensor; 4. Poor fuel injector atomization; 5. Carbon buildup in the intake manifold; 6. Insufficient ignition energy; 7. Faulty spark plugs; 8. Faulty idle control valve. The maintenance methods for car batteries are: 1. Turn off lights and audio before parking and shutting off the engine. Keeping lights on for a long time is very harmful to the battery; 2. Avoid not turning off the air conditioning when shutting off the engine. The air conditioning consumes a lot of power, and not turning it off for a long time will cause damage to the battery; 3. Drive the car for a while every certain period. If the car is left unused for a long time, the battery power will gradually decrease, leading to difficulty starting the car. Even if the car is not in use, drive it every few days to charge the battery, ensuring it always remains in a fully charged state.