how to fix my BMW 3 Series G20/G21 (2019-2024) that keeps stalling when idling?

Solution

1. Preparation

• Gather tools and parts.
• Disconnect the battery to ensure safety during repairs.

2. Clean Throttle Body

• Tools Required: Throttle body cleaner, soft cloth, socket set.
• Sub-steps:
  1. Remove the air intake duct connected to the throttle body.
  2. Use the throttle body cleaner and a soft cloth to clean any carbon buildup from the throttle plate and housing.
  3. Reattach the air intake duct securely.

3. Replace Fuel Filter

• Tools Required: Fuel line disconnect tool, socket set, rags.
• Sub-steps:
  1. Relieve fuel system pressure by removing the fuel pump fuse and running the engine until it stalls.
  2. Disconnect the fuel lines from the fuel filter using the fuel line disconnect tool.
  3. Remove the old fuel filter and install the new one, ensuring proper orientation.
  4. Reconnect the fuel lines and reinstall the fuel pump fuse.

4. Replace Spark Plugs

• Tools Required: Spark plug socket, torque wrench, socket set.
• Sub-steps:
  1. Disconnect the ignition coils by removing the electrical connectors.
  2. Unscrew the ignition coils using the socket set and remove them.
  3. Use the spark plug socket to remove the old spark plugs.
  4. Install new spark plugs with a torque specification of 22 ft-lbs.
  5. Reinstall the ignition coils and reconnect the electrical connectors.

5. Reconnect Battery

• Reconnect the battery terminals and ensure they are secure.