What Causes Car Noises?
2 Answers
The reason for a thumping sound when the car is running is: If it accompanies the change in vehicle speed with a periodic rhythm, it should be abnormal noise caused by rotating components such as wheels or drive shafts. Key inspections should focus on whether the rotating components like wheels or drive shafts are abnormal and whether there is any movement interference with surrounding fixed components. Below is extended content: 1. The drive shaft is a high-speed, minimally supported rotating body, so its dynamic balance is extremely important. Most drive shafts undergo dynamic balance testing before leaving the factory and are adjusted on a balancing machine. 2. For front-engine, rear-wheel-drive vehicles, the drive shaft transmits the operation from the transmission to the main reducer's shaft, which can consist of several sections connected by universal joints.
Last week while driving, I noticed a squeaking noise coming from the car's chassis, especially noticeable when turning. This situation might be caused by aging components in the suspension system, such as dried-out shock absorber bushings or loose ball joints on the control arms. It could also be vibration noise from worn exhaust pipe hangers, as metal parts develop gaps over time with use. During the last maintenance, the mechanic mentioned that such noises are mostly due to aging rubber components, and avoiding bumpy roads during daily driving can help prolong their lifespan. It's recommended to first check for any noticeably loose parts yourself. If the abnormal noise persists, it's best to get it inspected at a repair shop as soon as possible—chassis issues shouldn't be taken lightly.
