Most Likely Causes:
* Worn Ball Joints: These connect the control arms to the steering knuckles. Worn ball joints create play in the suspension, leading to wobble, especially at low speeds. Look for excessive movement or play in the ball joints when you jack up the front end and try to move the tires.
* Worn Tie Rod Ends: These connect the steering rack to the steering knuckles. Similar to ball joints, worn tie rod ends introduce slop in the steering system, resulting in wobble. Again, check for play by grabbing the tire and trying to move it from side to side.
* Worn Steering Rack Bushings or Mounting Points: Worn bushings or mounting points for the steering rack can allow the rack to move excessively, leading to imprecise steering and wobble.
* Worn or Damaged Control Arm Bushings: These bushings connect the control arms to the frame. Worn bushings will allow excessive movement in the suspension and cause instability.
* Bent Wheel: Although less likely to cause a wobble at only low speeds, a bent wheel can still contribute. Inspect the wheel for any obvious bends or damage.
* Uneven Tire Pressure: While unlikely to be the *sole* cause of a significant wobble, improperly inflated tires can exacerbate existing suspension problems.
* Loose Lug Nuts: Make absolutely sure all lug nuts are properly tightened.
Troubleshooting Steps:
1. Visual Inspection: Carefully inspect the entire front suspension and steering system for any obvious signs of damage, wear, or loose components. Look for cracks, leaks, or excessive play in the joints.
2. Check Tire Pressure: Ensure all tires are inflated to the manufacturer's recommended pressure (found on a sticker inside the driver's side doorjamb or in your owner's manual).
3. Check Lug Nuts: Ensure all lug nuts are properly tightened on all four wheels.
4. Test for Play: With the vehicle safely supported on jack stands, grab the tires at the 3 and 9 o'clock positions and try to move them side to side and up and down. Excessive play indicates worn components.
5. Professional Inspection: If you're not comfortable performing these checks yourself, take your Windstar to a qualified mechanic. They have the tools and expertise to properly diagnose and repair the problem. A thorough alignment check is also recommended after any suspension work.
Important Safety Note: Working under a vehicle can be dangerous. Always use jack stands and follow proper safety procedures when performing any repairs or inspections. If you are unsure about anything, take it to a qualified mechanic. Driving with a significant wobble is unsafe.
