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Home/Cars/BMW/3 Series/G20/G21 (2019-2024)/why is my BMW 3 Series making a noise when I hit a bump

why is my BMW 3 Series making a noise when I hit a bump

BMW 3 Series G20/G21 (2019-2024)

Severity: mediumDifficulty: medium2-4 hours
3 min read
470 words

Problem Statement

## Problem Statement The BMW 3 Series is producing a noise when driving over bumps, indicating a potential issue with the suspension system or components associated with the chassis.

Repair Time
2-4 hours

Safety Warnings

  • ⚠Safety Warnings:**
  • ⚠Always use jack stands when working under a vehicle.
  • ⚠Ensure the vehicle is securely raised before working on suspension components.

Symptoms

  • •Clunking or rattling noise when hitting bumps
  • •Diminished ride comfort and handling
  • •Uneven tire wear
  • •Visible wear or damage on suspension components
  • •Vehicle may pull to one side

Diagnostic Steps

  1. 1Inspect the suspension components visually for any signs of damage or excessive wear.
  2. 2Check for loose or damaged mounting bolts on the struts and shocks.
  3. 3Perform a bounce test on each corner of the car to assess shock absorber function.
  4. 4Examine the sway bar links and bushings for wear or damage.
  5. 5Inspect the control arms and bushings for play or deterioration.

Solution

Solution

1. Preparation

  • Gather tools and parts required for the repair.
  • Ensure the vehicle is parked on a level surface and engage the parking brake.
  • Disconnect the battery to ensure safety while working on electrical components.

2. Raise the Vehicle

  • Use a jack to lift the vehicle and secure it on jack stands.
  • Remove the wheels to gain access to the suspension components.

3. Inspect and Replace Components

  • Shock Absorbers/Struts:

    • Remove the bolts securing the shocks/struts to the vehicle.
    • Inspect for leakage; if damaged, replace them with new units.
    • Torque the new bolts to manufacturer specifications.
  • Sway Bar Links and Bushings:

    • Remove the bolts securing the sway bar links.
    • Replace worn links and bushings with new ones.
    • Ensure proper alignment and tighten to specifications.
  • Control Arms and Bushings:

    • Detach the control arms from the mounting points.
    • Replace any damaged control arms or bushings.
    • Reinstall and torque bolts as per manufacturer specifications.

4. Reassemble and Lower Vehicle

  • Reinstall the wheels and lower the vehicle from the jack stands.
  • Reconnect the battery.

Verification

After completing the repair, verify that the issue has been resolved:

  • Test the affected component to ensure it functions correctly
  • Check for any error codes or warning lights
  • Monitor the vehicle for a few days to ensure the issue does not recur

Prevention Tips

To prevent this issue from occurring again:

  • •Follow the manufacturer's recommended maintenance schedule
  • •Address warning signs early before they develop into major issues
  • •Use quality parts and fluids recommended for your vehicle
  • •Keep detailed records of all repairs and maintenance

Tools & Equipment Required

  • Socket set
  • Torque wrench
  • Jack and jack stands
  • Wrench set
  • Pliers

Parts Required

  • Shock absorbers/struts (if needed)
  • Sway bar links
  • Sway bar bushings
  • Control arms (if needed)

Additional Information

Repair Time

2-4 hours

Difficulty

medium

Severity

medium

Tools

5 items

Parts

4 items

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