my BMW X3 F25 (2011-2018) makes a strange noise when I accelerate

Solution

1. Preparation

• Tools Required:
  • OBD-II scanner
  • Socket set
  • Torque wrench
  • Jack and jack stands
  • Flashlight
• Safety Warnings:
  • Ensure the vehicle is on a flat surface and securely supported by jack stands.

2. Inspect and Replace Engine/Transmission Mounts

1. Lift the Vehicle: Use the jack to raise the vehicle and secure it with jack stands.
2. Remove Underbody Covers: If applicable, remove any underbody panels obstructing access to mounts.
3. Inspect Mounts:
   • Visually check for cracks or separation in rubber mounts.
   • Use a pry bar to test for excessive movement.
4. Replace Any Damaged Mounts:
   • Remove the bolts securing the mounts using a socket set.
   • Install new mounts and torque bolts to manufacturer's specifications.

3. Serpentine Belt and Pulleys Inspection

1. Check Belt Condition:
   • Look for signs of wear, such as cracks or fraying.
2. Test Tension:
   • Ensure the belt has proper tension; it should not deflect more than 1/2 inch when pressed.
3. Replace if Necessary:
   • To replace, release tension using a wrench on the tensioner pulley, then remove the belt. Install a new belt in the proper routing and restore tension.

4. Exhaust System Check

1. Visual Inspection:
   • Look for loose clamps, hangers, or any signs of exhaust leaks.
2. Tighten or Replace Components:
   • Tighten any loose bolts or replace damaged exhaust hangers as needed.

5. Drive Shaft and CV Joints Examination

1. Inspect for Damage:
   • Check the drive shaft and CV joints for cracks or excessive play.
2. Replace if Necessary:
   • If signs of wear are evident, remove the drive shaft by unbolting it from the differential and transmission, then replace with a new unit and torque bolts to specifications.