What causes abnormal noises when the car is running?
2 Answers
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.
Having driven for over a decade, I've found that unusual noises usually come from chassis or tire issues. For example, uneven tire wear or nails stuck in the tread can cause a rattling sound while driving; worn wheel hub bearings produce a humming noise, especially noticeable at high speeds. Damaged shock absorbers in the suspension system create a bouncing sensation accompanied by thumping sounds, while loose ball joints or control arms can also cause similar noises. Once during a long business trip, the noise suddenly intensified—it turned out to be loose screws in the rear suspension components, nearly causing an accident. I immediately slowed down and pulled over to inspect. If the noise occurs during turns, it might be due to worn drive shaft universal joints or brake system drag. I recommend first stopping to check tire surfaces for foreign objects or abnormal wear, noting whether the noise changes with speed, and promptly visiting a professional shop for inspection to avoid safety hazards. Remember, regular maintenance can effectively prevent such failures.
