why does my BMW X3 F25 (2011-2018) make a loud noise when I start it

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative terminal of the battery to ensure safety during repairs.

2. Inspect and Replace Engine Oil

• Sub-steps:
  • Drain the old engine oil using an oil catch pan.
  • Replace with the manufacturer-recommended engine oil type and viscosity.
  • Install a new oil filter to ensure proper filtration.

3. Check and Replace Timing Chain/Belt Tensioner

• Sub-steps:
  • Remove any engine covers that obstruct access to the timing chain/belt area.
  • Inspect the tensioner for wear and replace if necessary.
  • If the chain/belt shows signs of excessive play or wear, replace it according to the manufacturer's specifications.

4. Inspect Starter Motor

• Sub-steps:
  • Remove the starter motor from the vehicle.
  • Test the starter for proper operation using a multimeter.
  • Replace the starter if it shows signs of failure.

Tools Required:

• OBD-II scanner
• Oil catch pan
• Socket set
• Torque wrench
• Multimeter

Parts Required:

• Engine oil (as per specification)
• Oil filter
• Timing chain/belt tensioner (if worn)
• Starter motor (if faulty)

Estimated Repair Time: 2-4 hours

Safety Warnings:

• Disconnect the battery before working on electrical systems.
• Allow the engine to cool before inspecting any components related to the engine.