why does my BMW 5 Series G30/G31 (2017-2024) keep stalling at traffic lights

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Disconnect the battery to ensure safety while working on electrical components.

2. Clean or Replace Throttle Body

• Tools Required: Throttle body cleaner, microfiber cloth, socket set.
• Sub-steps:
  1. Remove the air intake duct connected to the throttle body.
  2. Unbolt the throttle body from the intake manifold using the socket set.
  3. Clean the throttle body using throttle body cleaner and a microfiber cloth to remove carbon buildup.
  4. If heavily damaged, replace with a new throttle body.
  5. Reinstall the throttle body and secure it with bolts to the specified torque value (typically around 10-15 Nm).
  6. Reattach the air intake duct.

3. Inspect and Replace Ignition Components

• Tools Required: Spark plug socket, torque wrench, multimeter.
• Sub-steps:
  1. Remove the ignition coil covers to access the ignition coils.
  2. Test each ignition coil with a multimeter for proper resistance (typically 0.5-1.5 ohms).
  3. Remove and inspect spark plugs for wear; replace if necessary (gap specification is usually around 0.7-0.8 mm).
  4. Install new ignition coils if any fail the test or show signs of wear.
  5. Reinstall the ignition coil covers.

4. Clean or Replace Mass Airflow Sensor (MAF)

• Tools Required: MAF cleaner, screwdriver set.
• Sub-steps:
  1. Disconnect the electrical connector from the MAF sensor.
  2. Remove the MAF sensor from the air intake duct using a screwdriver.
  3. Clean the MAF sensor with MAF cleaner; avoid touching the sensor elements directly.
  4. If cleaning does not resolve issues, replace the MAF sensor with a new one.
  5. Reinstall the MAF sensor and reconnect the electrical connector.