Why is there a regular buzzing noise after reaching 40 km/h?
2 Answers
There is a regular buzzing noise after reaching 40 km/h because: 1. Engine noise: Engine noise indicates that the technical state of a certain mechanism in the engine has changed, mainly due to excessive wear of some parts or improper assembly and adjustment. It should be repaired in time to prevent the fault from expanding. 2. Transmission noise: The transmission has many parts, and the causes of noise are relatively complex. If the transmission noise is obvious, it is recommended to send it to a professional repair shop to identify the faulty part and then replace it. 3. Door noise: Door noise is mainly caused by lack of lubrication. Determine whether it is the door hinge position or the internal components of the door, such as the window regulator, door lock mechanism, or handle mechanism. If it is the door hinge or limiter, a special door hinge and slide lubricant can be used, while the internal components of the door, such as the window regulator, door lock mechanism, or handle mechanism, can be lubricated with a special door accessory lubricant.
When driving, I hear a regular humming sound once the speed exceeds 40 km/h? This issue is quite common. My own car had a similar problem before, which turned out to be due to worn rear wheel bearings—something that tends to happen as the car ages. At higher speeds, increased bearing friction causes a humming noise. Poor tire balancing or uneven tire wear could also be the culprit. If the rhythm of the humming changes with vehicle speed, it’s definitely related to rotating components. I recommend first checking the tire condition yourself for obvious uneven wear or low pressure. If that doesn’t help, visit a repair shop promptly. Replacing bearings costs a few hundred dollars, which isn’t too expensive, but delaying repairs could lead to wheel seizure, posing serious risks. Make it a habit to pay attention to unusual sounds while driving to ensure vehicle safety and reliability. Regular oil changes can also help prevent such issues.
