my BMW X3 G01 (2018-2024) has rough idle after starting what to check

Solution

1. Preparation

• Ensure the vehicle is parked on a flat surface and securely turned off.
• Disconnect the negative terminal of the battery to prevent electrical shorts.
• Gather required tools and parts.

2. Scan for Error Codes

• Use an OBD-II scanner to check for any codes that may indicate specific issues.
• Document any codes and research their meanings before proceeding.

3. Clean the Throttle Body

• Remove the intake duct connected to the throttle body.
• Use throttle body cleaner and a soft cloth to clean the inside of the throttle body thoroughly.
• Reinstall the intake duct and reconnect any sensors.

4. Inspect and Replace Spark Plugs

• Remove the ignition coils by unscrewing the retaining bolts.
• Pull out the spark plugs using a spark plug socket.
• Inspect the spark plugs for wear; replace them if necessary, ensuring to gap them according to specifications.
• Reinstall the ignition coils.

5. Check Fuel System

• Attach a fuel pressure gauge to the fuel rail's test port.
• Turn the ignition to the "ON" position (do not start) to check the fuel pressure.
• If the pressure is below specifications, inspect the fuel pump and filter; replace if necessary.

6. Reconnect Battery

• Reconnect the negative battery terminal securely.
• Start the engine and allow it to idle while monitoring for any abnormal behavior.