my BMW X3 F25 (2011-2018) engine stalls when idling what's wrong

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery to avoid electrical shorts.
• Allow the engine to cool if it has been running.

2. Clean Throttle Body

• Remove the throttle body from the intake manifold.
• Use throttle body cleaner and a soft brush to remove carbon deposits.
• Reinstall the throttle body with new gaskets and torque to specifications (typically around 10-15 Nm).

3. Replace Spark Plugs and Ignition Coils

• Remove the ignition coil covers.
• Disconnect the ignition coils and remove them from the spark plugs.
• Replace spark plugs with OEM specifications (typically NGK or Bosch).
• Reinstall ignition coils and ensure they are properly seated.

4. Address Fuel Delivery Issues

• Connect a fuel pressure gauge to the fuel rail.
• Turn the ignition on (do not start) and check the fuel pressure; it should typically be around 50-60 psi for the BMW X3.
• If pressure is low, inspect the fuel pump and fuel filter; replace if necessary.

5. Inspect and Replace MAF Sensor (if necessary)

• Disconnect the MAF sensor connector.
• Remove the MAF sensor from the air intake.
• Clean the MAF sensor with MAF cleaner or replace it if found defective.
• Reinstall the MAF sensor and reconnect the connector.