why does my BMW 3 Series E90/E91 vibrate at high speeds?

Solution

1. Tire Inspection

• Sub-steps:
  • Remove the wheels using a socket set.
  • Visually inspect the tread depth and sidewalls of each tire.
  • Replace any damaged or excessively worn tires.

2. Wheel Balancing

• Sub-steps:
  • Mount each wheel on a wheel balancer.
  • Spin the wheel to identify any imbalances.
  • Add wheel weights as necessary to balance each wheel.

3. Suspension Inspection

• Sub-steps:
  • Lift the vehicle using a hydraulic jack and secure it with jack stands.
  • Inspect shocks and struts for leaks and wear.
  • Check control arms and bushings for signs of wear; replace if necessary.

4. Wheel Alignment

• Sub-steps:
  • Position the vehicle on an alignment rack.
  • Adjust the camber, caster, and toe settings according to manufacturer specifications.
  • Test drive to ensure no pulling occurs after alignment adjustment.

5. Driveshaft and Axle Inspection

• Sub-steps:
  • Inspect the driveshaft for any visible damage or excessive play.
  • Check CV joints for signs of damage or grease leakage.
  • Replace damaged driveshaft components if necessary.

Tools Required:

• Socket set
• Wheel balancer
• Hydraulic jack
• Jack stands
• Alignment machine

Parts Required:

• Tires (if necessary)
• Wheel weights
• Suspension components (if worn)

Estimated Repair Time: 2-4 hours

Safety Warnings:

• Always ensure the vehicle is securely lifted and supported before working underneath.
• Disconnect the battery if working on electrical components.