why does my BMW X3 F25 (2011-2018) sound like a diesel engine when running

Solution

1. Preparation

• Gather tools and materials required for inspection and repair.
• Ensure the vehicle is parked on a flat surface and secured with wheel chocks.
• Disconnect the battery to ensure safety during electrical inspections.

2. Engine Oil Inspection and Change

• Sub-steps:
  • Remove the oil dipstick and check the oil level.
  • If oil is low, add the recommended viscosity oil as specified in the owner's manual.
  • If oil is dirty or due for a change, drain the old oil using a wrench to remove the oil drain plug.
  • Replace the oil filter using an oil filter wrench, ensuring to apply a thin layer of oil on the new filter's gasket.
  • Refill the engine with new oil through the oil filler cap.
• Tools Required: Oil filter wrench, socket set, oil drain pan, new oil, new oil filter.

3. Inspect and Replace Fuel Injectors

• Sub-steps:
  • Remove the engine cover to access the fuel rail and injectors.
  • Disconnect the fuel lines from the fuel rail; ensure to relieve fuel pressure first.
  • Remove the fuel injectors from the rail and inspect for clogs or damage.
  • Clean or replace fuel injectors as necessary, ensuring proper sealing upon reinstallation.
  • Reassemble the fuel system and recheck for leaks.
• Tools Required: Fuel line disconnect tool, socket set, injector cleaning kit or new injectors.

4. Exhaust System Inspection and Repair

• Sub-steps:
  • Visually inspect the exhaust system for any visible cracks, holes, or loose connections.
  • Tighten any loose clamps or mounts and replace any damaged sections of the exhaust.
  • Conduct a smoke test if necessary to identify leaks not visible during inspection.
• Tools Required: Socket set, exhaust repair clamps, exhaust sealant as needed.

5. Timing Chain/Belt Inspection

• Sub-steps:
  • Remove necessary components to gain access to the timing chain/belt.
  • Inspect for any signs of wear, such as fraying or slack.
  • If wear is noted, replace the timing chain/belt and any associated tensioners.
• Tools Required: Timing tool set, socket set, torque wrench.