What are the reasons for the loud noise inside the Haval H2?

[HaleyLynn]

Haval H2's loud interior noise is due to engine damage, which can be categorized into two types: cold engine abnormal noise and hot engine abnormal noise. Cold engine abnormal noise refers to the unusual sounds emitted from the engine compartment when the car is parked, which automatically disappear after the car is warmed up. This happens because when the car is parked for a long time, the lubricating oil basically flows back to the oil pan. During a cold start, the oil pump cannot immediately establish oil pressure, and the oil film between components, especially the valves inside the cylinder head, cannot be lubricated during a cold start. Both hydraulic lifters and mechanical rocker arms will have a certain valve clearance, or the timing chain with insufficient oil pressure cannot work properly, resulting in a clicking sound. There are many reasons for hot engine abnormal noise, generally due to damaged or faulty car components. For example, the engine oil viscosity is too high, there is carbon buildup in the engine cylinders, or there is valve leakage, which require timely repairs.