What Causes Vehicle Body Vibration at Speeds of 80 to 100?
2 Answers
Vehicle body vibration at speeds of 80 to 100 is often caused by severe engine carbon deposits or similar issues. Severe Engine Carbon Deposits: Severe engine carbon deposits are one of the most common reasons for vehicle vibration, typically due to excessive carbon buildup in the fuel injectors or a dirty throttle body. Excessive carbon deposits inside the engine can absorb the gasoline sprayed during cold starts, leading to an overly lean air-fuel mixture and difficulty starting. Users should clean the fuel system and check the idle control valve for carbon buildup, which should be cleaned if necessary. Ignition System Issues: Ignition system problems can also cause such symptoms. It is advisable to inspect the condition of the spark plugs, high-voltage wires, and ignition coils. Poor performance of the ignition system or improper spark plug firing can lead to these issues. Check if the spark plugs are excessively carbon-fouled and replace them if necessary.
I often drive on highways, and when the speed reaches 80 to 100, the car body shakes severely, which is often related to the tires. If the wheel balancing is not done properly, uneven rotation of the wheels can cause shaking, especially after replacing new tires or repairing them—this is when the problem is most likely to occur. I've experienced this before; a deformed wheel hub can also cause this, making the car feel like it's swaying while driving. Additionally, uneven tire pressure, with one side too inflated and the other too flat, can worsen vibrations at high speeds. Furthermore, severe tread wear or bulges can affect driving stability. I recommend you first check the tire pressure and adjust it to the normal value. If the shaking persists, go to a professional shop for a balancing test immediately. Also, check the tire condition during regular maintenance to avoid affecting driving safety.
