* Worn or damaged ball joints: These connect the control arms to the steering knuckles. Worn ball joints allow excessive play, leading to shaking, especially noticeable at low speeds. A visual inspection may reveal excessive play or grease leaks.
* Worn tie rod ends: These connect the steering rack to the steering knuckles. Similar to ball joints, worn tie rod ends create slop in the steering system, causing shaking. Again, look for excessive play or damage.
* Worn or damaged wheel bearings: Worn wheel bearings create a rough, rumbling sensation that can translate into steering wheel shake. This is often accompanied by humming or grinding noises.
* Bent or damaged rims/wheels: A bent rim or wheel will cause vibrations that are felt most intensely at lower speeds. Inspect the wheels carefully for any bends or damage.
* Uneven tire wear: Significant uneven tire wear (cupping, feathering) can cause vibrations. Check the tire tread depth and pattern for irregularities. Consider tire balancing as well (see below).
* Out-of-balance tires or wheels: This is a common cause of vibrations at various speeds, but particularly noticeable at lower speeds. A tire balancing is relatively inexpensive and should be done.
* Brake rotor warping: Warped brake rotors can cause pulsations in the brake pedal and steering wheel, especially when braking.
* Problem with the power steering system: While less common to cause shaking specifically at low speeds, a leak or failing component in the power steering system *could* contribute.
Troubleshooting Steps:
1. Visual Inspection: Carefully examine the front suspension components (ball joints, tie rod ends, etc.) for any visible damage, leaks, or excessive play. Jack up the vehicle safely and use a pry bar to check for excessive movement in these components (use caution!).
2. Tire Inspection: Check tire tread depth and condition for uneven wear. Inspect wheels for bends or damage.
3. Tire Rotation and Balancing: Have your tires rotated and balanced. This is a relatively inexpensive first step.
4. Brake Rotor Inspection: Inspect the brake rotors for warping (they'll look uneven or have high and low spots).
5. Professional Inspection: If you're not comfortable performing a visual inspection or aren't mechanically inclined, take your Windstar to a qualified mechanic for a thorough inspection. They'll have the tools and expertise to diagnose the problem accurately.
It's crucial to address the shaking steering wheel promptly. Driving with a damaged suspension or steering system can be dangerous.
