What are the reasons for difficulty in starting a sedan?

[VanJack]

Reasons for difficulty in starting a sedan: 1. Poor quality gasoline that does not meet standards; 2. Oxygen sensor failure; 3. Air flow sensor failure; 4. Spark plug carbon buildup; 5. Engine knocking; 6. Damaged water temperature sensor; 7. High-pressure fuel pump damage, leading to engine misfire. The car engine is the device that provides power to the car, serving as the heart of the vehicle and an energy conversion device. Its function is to convert the thermal energy of gasoline or diesel into mechanical energy by burning the expanding gas in a sealed cylinder, thereby pushing the piston to perform work. Depending on the power source, car engines can be divided into diesel engines, gasoline engines, electric vehicle motors, and hybrid engines, among others.