What causes body vibration in a Volkswagen Polo at high speeds?
2 Answers
The reasons for body vibration in a Volkswagen Polo at high speeds include severe engine carbon buildup and aging of engine mount rubber. Excessive dirt in the throttle body and carbon buildup in the fuel injectors: After driving a certain distance, excessive dirt in the throttle body can cause it to not close properly or the idle speed stepper motor to get stuck, both of which can result in excessively high engine idle speed. Carbon buildup generated during engine operation can also cause vehicle vibration. Therefore, when vibration occurs, the throttle body and fuel injectors should be inspected first. If excessive dirt in the throttle body or carbon buildup in the fuel injectors is found, they should be cleaned promptly. Aging of engine mount rubber: The engine mount rubber is essentially the engine's vibration damping system, responsible for absorbing minor vibrations during engine operation.
I also experienced body vibration issues when driving my Volkswagen Polo on the highway. That time I was rushing for a business trip out of town, and when the speed reached 100 km/h, the entire steering wheel started shaking, and the seats were vibrating too. After pulling into a service area for inspection, I found out it was a front wheel balancing issue. The guy at the tire shop fixed it by adding a few small lead weights to the inside of the wheel rim. However, he also reminded me that such vibrations could also be caused by worn half-shafts, especially in older cars. Another friend of mine had severe vibration when braking at high speeds due to warped brake discs. If the wheel rims are deformed from impacts, it can cause similar issues too. He suggested starting with a wheel balancing test as the easiest solution. If that doesn't work, then check the drivetrain components, since high-speed vibrations significantly affect driving safety.
