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What would cause your 2003 cavalier steering wheel to shake and bounce when going 100km?

Several factors could cause your 2003 Cavalier's steering wheel to shake and bounce while traveling at 100 km/h. Here are some possible causes:

1. Unbalanced Tires: Unbalanced tires are a common cause of steering wheel vibrations. When tires are not balanced properly, they can create an uneven distribution of weight, which can cause the steering wheel to shake or wobble.

2. Misaligned Wheels: Misaligned wheels can also cause steering wheel vibrations. When the wheels are not aligned correctly, they can cause the vehicle to pull to one side or the other and may also cause the steering wheel to shake.

3. Worn Steering Components: Worn steering components, such as tie rods, ball joints, or control arms, can also lead to steering wheel vibrations. Over time, these components can wear out and cause play in the steering system, which can result in shaking or bouncing.

4. Bent Rim: If the rim of one or more of your tires is bent, it can cause the wheel to wobble, which in turn will cause the steering wheel to vibrate.

5. Brake Problems: If your brake rotors are warped or your brake calipers are sticking, it can cause the steering wheel to shake when you brake.

6. Engine or Transmission Problems: In rare cases, steering wheel vibrations can be caused by engine or transmission problems. For example, if your engine is misfiring, it can cause the steering wheel to vibrate.

If you are experiencing steering wheel vibrations, it is important to have your vehicle inspected by a qualified mechanic as soon as possible. Ignoring steering wheel vibrations can be dangerous and could lead to an accident.