What Causes the Abnormal Noise When a Car Reaches 90 to 100 km/h?

[McArya]

Car makes abnormal noise when reaching 100 km/h due to the following reasons: 1. Engine abnormal noise: Some components are excessively worn or improperly installed and adjusted. 2. Transmission abnormal noise: Common gear shaft failure or insufficient transmission oil. 3. Wear-related abnormal noise: Certain parts of the car body produce some abnormal noises when accelerating or braking. More details about engine abnormal noise are as follows: 1. Explanation one: Engine abnormal noise indicates that the technical state of a certain engine mechanism has changed. Some abnormal noises can also predict potential catastrophic engine failures, but there are exceptions, such as the sharp squealing sound of the belt, which is mostly caused by belt slippage. 2. Explanation two: There is a sharp sound of metal dry friction, which is mostly caused by damage to the bearings of the generator, water pump, or power steering pump. When the engine produces abnormal noise, it should be repaired immediately to prevent the fault from expanding.