What causes abnormal noises when the car is running?

[Lorenzo]

Vehicle driving abnormal noise causes are as follows: 1. Exhaust pipe deformation: Generally, the exhaust pipe of front-engine models extends from the bottom of the car to the rear. When driving on rough roads or bumping the chassis, it is easy to cause the exhaust pipe to dent and deform. The deformed exhaust pipe increases exhaust resistance, resulting in a buzzing noise and resonance sensation. 2. Engine abnormality: Mainly caused by excessive wear of some parts or improper assembly and adjustment. Some abnormal noises can still be predicted, while engine abnormal noises may lead to accident damage. Therefore, when the engine makes abnormal noises, it should be repaired in time to prevent the fault from expanding.