What are the reasons for a car not moving when in gear?

[VanLuke]

When a car does not move after shifting into gear, it is a comprehensive functional fault involving the clutch, transmission, and drive axle. The main issue is often due to difficulty in cold starts. Reasons for difficulty in cold starts: Poor fuel quality, especially with low-grade fuel that has poor volatility. During winter when temperatures are low, the engine block temperature is also low, making it difficult for the fuel to atomize. This results in insufficient mixing of fuel and air in the cylinders, leading to difficulty starting or even failure to start. The lower the temperature, the more fuel is required for a cold start, and the presence of carbon deposits can significantly affect the success of the cold start. Carbon deposits in various parts of the engine can negatively impact its normal operation. Solutions: Replace the fuel pump, adjust the valve clearance, inspect and promptly replace the coolant temperature sensor, and replace the relay.