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

[AshleyDella]

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.