What Causes a Car to Shake at High Speeds?
2 Answers
Reasons for body shaking at high speeds: 1. Incorrect front wheel alignment angle, excessive toe-in; 2. Low front tire pressure or imbalance caused by repairs; 3. Deformed front wheel rims or incorrect number of tire bolts; 4. Loose installation of transmission system components, bent drive shaft, power imbalance, deformed front axle; 5. Failed shock absorbers, inconsistent stiffness of front leaf springs. Additional information: If vibration occurs at higher speeds and causes the steering wheel to shake, you can first lift the drive axle, secure the front wheels with safety blocks, start the engine, and gradually shift into higher gears to reach the final test vibration speed. If both the body and steering wheel shake at this point, it is vibration caused by the transmission system.
Having worked on cars for so many years, the most common reason for a car to shake at high speeds is unbalanced tires, meaning the dynamic balance wasn't done properly, causing vibrations to amplify at high speeds. Deformed or damaged rims can also cause this, such as after hitting a curb, where an unbalanced rim leads to shaking. Additionally, a loose suspension system or faulty shock absorbers due to lack of lubrication can make the car body wobble and feel unstable. Worn-out universal joints on the drive shaft or issues with the half-shaft can also cause shaking, especially noticeable during high-speed turns. Problems in the braking system, like warped brake discs or contamination, or a malfunctioning power steering system, can also lead to shaking. If these issues aren't addressed promptly, they can accelerate tire wear, reduce braking effectiveness, and even increase fuel consumption and accident risks. It's recommended to first check the tires and balance weights, perform a four-wheel alignment and dynamic balance; if that doesn't help, have a professional inspect the suspension or drive components. Regular maintenance can prevent these issues from arising.
