what causes the engine to misfire in my BMW 5 Series G30/G31 (2017-2024)?

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Disconnect the battery to ensure safety.
• Allow the engine to cool completely before starting work.

2. Replace Spark Plugs

• Tools Required: Spark plug socket, ratchet, torque wrench.
• Sub-steps:
  1. Remove the ignition coil connectors carefully.
  2. Unbolt and remove the ignition coils.
  3. Use the spark plug socket to remove old spark plugs.
  4. Inspect and clean the spark plug wells.
  5. Install new spark plugs, torquing them to the manufacturer's specification (typically 18-22 Nm).
  6. Reinstall the ignition coils and reconnect the electrical connectors.

3. Inspect and Replace Ignition Coils (if necessary)

• Tools Required: Socket set, ratchet.
• Sub-steps:
  1. Remove ignition coil connectors and bolts as previously done.
  2. Visually inspect coils for cracks or damage; replace any faulty coils.
  3. Install new ignition coils and reconnect the connectors.

4. Clean or Replace Fuel Injectors

• Tools Required: Fuel injector cleaner kit or new fuel injectors.
• Sub-steps:
  1. Remove the fuel rail as per service manual instructions.
  2. Clean existing injectors using a cleaning kit or replace them with new units.
  3. Reassemble the fuel rail with new or cleaned injectors, ensuring proper sealing.

5. Check for Air Intake Issues

• Tools Required: Screwdriver set, cleaning supplies.
• Sub-steps:
  1. Inspect the air intake system for any leaks or blockages.
  2. Clean the throttle body and air filter if necessary.
  3. Ensure all connections are secure before reassembling.