What Causes the Buzzing Sound Inside the Car at Idle That Can't Be Heard Outside?
1 Answers
Idle abnormal noise is caused by unbalanced drive shaft vibration. Below is an introduction to drive shaft-related abnormal noise: Sound characteristics: The symptom of an unbalanced drive shaft is a periodic noise heard during vehicle operation, which intensifies with speed. In severe cases, it may cause body shaking, with a numb sensation felt when holding the steering wheel. Main causes of the fault: A bent or dented drive shaft creates imbalance during operation, leading to wobbling and noise. Alternatively, improper drive shaft installation may occur if the universal joint forks at both ends are not aligned on the same plane. Or, if the original balance weights are not reinstalled in their correct positions, the balance state is disrupted, resulting in noise and vibration.