how to fix my BMW 5 Series F10/F11 (2010-2017) engine misfire problems

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a level surface with the engine off and cooled down.
• Disconnect the negative terminal of the battery.

2. Replace Spark Plugs

• Tools Required: Spark plug socket, ratchet, torque wrench
• Sub-steps:
  1. Remove the engine cover if applicable.
  2. Disconnect the ignition coil connectors.
  3. Unscrew and remove the ignition coils.
  4. Use a spark plug socket to carefully remove the old spark plugs.
  5. Install new spark plugs by hand to prevent cross-threading.
  6. Torque the spark plugs to the manufacturer's specification (typically 22 ft-lbs).
  7. Reinstall the ignition coils and connect the connectors.

3. Replace Faulty Ignition Coils

• Tools Required: Ratchet, socket set
• Sub-steps:
  1. Identify and remove the faulty ignition coil based on diagnostic results.
  2. Install the new ignition coil in place.
  3. Reconnect the ignition coil connector.
  4. Repeat for all faulty ignition coils identified during diagnostics.

4. Clean or Replace Fuel Injectors

• Tools Required: Fuel injector cleaning kit or replacement injectors
• Sub-steps:
  1. Disconnect the fuel supply line and return line from the fuel rail.
  2. Remove the fuel rail by unscrewing it from the intake manifold.
  3. Carefully remove the fuel injectors from the rail.
  4. If cleaning, follow the injector cleaning kit instructions; if replacing, install new injectors.
  5. Reinstall the fuel rail and reconnect fuel lines.

5. Checking Engine Compression

• Tools Required: Compression gauge
• Sub-steps:
  1. Remove the spark plugs.
  2. Insert the compression gauge into the spark plug hole.
  3. Crank the engine for a few seconds and record the compression reading.
  4. Repeat for each cylinder and compare results; replace any cylinder with low compression.