What causes the thumping sound when the car is running?
2 Answers
If the thumping sound changes with the vehicle speed and has a periodic rhythm, it is likely abnormal noise from rotating components such as the wheels or drive shaft. Key inspections should focus on whether these rotating parts are functioning abnormally or interfering with surrounding fixed components. The function of the drive shaft is: Together with the transmission and drive axle, it transmits the engine's power to the wheels, generating driving force for the car. The functions of the tires are: 1. Transmitting driving force, braking force, and steering force to operate the vehicle; 2. Supporting the vehicle load; 3. Reducing and absorbing vibrations and impacts during driving to prevent severe vibrations from damaging car components.
I also encountered this kind of thumping noise while driving last time, and it was quite annoying. The most common cause is tire issues, such as tire pressure being too low or too high, leading to imbalance and noise while driving. It could also be due to worn-out wheel hub bearings, especially when the noise becomes more noticeable at higher speeds. Additionally, check if there are any nails puncturing the tire, bulges, or severe wear, as these could be the culprits. The suspension system shouldn't be overlooked either; worn-out shock absorbers or loose springs can also cause thumping noises, affecting safe driving. It's best to visit a professional repair shop as soon as possible to check the tires and suspension. Regularly checking tire pressure can help prevent such situations. You can try driving slowly to listen for the direction of the noise, but this is only a preliminary assessment. Don't delay repairs to avoid accidents.
