how to fix the rough idle issue in my BMW 5 Series F10/F11 (2010-2017)

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the engine is cool before starting.
• Disconnect the battery to prevent electrical shorts.

2. Inspect and Replace Spark Plugs

• Remove the ignition coil covers using a socket set.
• Disconnect the ignition coils and remove them using a ratchet.
• Extract the old spark plugs using a spark plug socket.
• Inspect the spark plugs for wear and replace with new ones (OEM recommended).
• Reinstall the ignition coils and covers.

3. Clean Throttle Body

• Remove the air intake duct connected to the throttle body.
• Use throttle body cleaner and a soft cloth to clean the throttle plate and interior.
• Reassemble the air intake duct securely.

4. Check and Clean Fuel Injectors

• Remove the fuel rail with injectors attached (ensure fuel system is depressurized).
• Clean the fuel injectors using a specialized injector cleaning kit or replace them if necessary.
• Reinstall the fuel rail ensuring proper sealing.

5. Inspect and Repair Vacuum Leaks

• Use a smoke machine or carburetor cleaner to identify vacuum leaks in the intake manifold.
• Replace any damaged vacuum hoses or gaskets as necessary.
• Reassemble all components securely.

6. Final Checks

• Reconnect the battery.
• Start the engine and let it idle, ensuring smooth operation.