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What Causes the Car to Shake When Driving at 100 km/h?

2 Answers

AshleyDella

07/29/25 9:04pm

Reasons for car body shaking at around 100 km/h include: 1. Improper engine air-fuel mixture: When the vehicle reaches around 100 km/h, the engine fault light may be on or suddenly turn on, accompanied by car body shaking. This is caused by an improper engine air-fuel mixture, with common issues being spark plugs, ignition coils, fuel injectors, carbon deposits, fuel pump, etc., leading to poor performance in one or multiple cylinders. The cause can be determined by checking the engine fault codes. 2. Aging or damage to engine or transmission mounts: Resonance caused by aging or damage to engine or transmission mounts. In this case, inspect the mounts and replace them if damaged to resolve the issue. 3. Damage to chassis half-shaft or drive shaft: Damage to the chassis half-shaft or drive shaft, often occurring during acceleration or deceleration. Inspect and replace the faulty drive shaft or half-shaft. 4. Need for tire and wheel rim balancing: Tires and wheel rims may require balancing, or there could be aging and deformation of tires or wheel rims. This situation is often accompanied by steering wheel shaking. Perform tire balancing as needed to check the condition of tires and wheel rims.

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NathanAnn

08/15/25 7:08pm

I used to drive long distances frequently and noticed that the car would shake when reaching 100 km/h, which is no small issue. The main reasons could be unbalanced tires—maybe the small lead weights on the wheels fell off, requiring a dynamic balance test at the repair shop. It could also be due to tire deformation or uneven wear, necessitating rotation or replacement. Another possibility is aging suspension components, such as failed shock absorbers, which amplify vibrations over bumps. Additionally, the wheel rims might have been dented and are no longer round, or the brake discs could be warped, causing interference during braking. I recommend checking tire pressure and wheels first—it’s simple and cost-effective. High-speed shaking isn’t just uncomfortable; it can also lead to loss of control, which is dangerous. I always address it promptly because driving should be about safety and comfort.

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