my BMW 3 Series F30/F31 (2012-2019) has poor acceleration, what could be the cause?

Solution

1. Preparation

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

2. Inspect and Clean the Throttle Body

• Remove the air intake duct from the throttle body using a socket set.
• Use throttle body cleaner and a clean cloth to remove carbon deposits from the throttle plate and surrounding area.
• Reattach the air intake duct and secure with appropriate clamps.

3. Replace Fuel Filter (if applicable)

• Locate the fuel filter, typically located along the fuel line.
• Relieve fuel system pressure by removing the fuel pump fuse and starting the engine until it stalls.
• Disconnect fuel lines from the filter using a line disconnect tool.
• Replace the old filter with a new one, ensuring proper orientation.
• Reconnect fuel lines and reinstall the fuel pump fuse.

4. Replace Spark Plugs

• Remove the ignition coils by unfastening any retaining bolts and disconnecting the electrical connectors.
• Unscrew the old spark plugs using a spark plug socket and ratchet.
• Install new spark plugs, ensuring the correct gap and torque (typically 22 lb-ft).
• Reinstall ignition coils and reconnect electrical connectors.

5. Test Drive and Monitor

• Reconnect the battery and clear any error codes using the OBD-II scanner.
• Start the engine and let it idle to check for any irregularities.
• Take the vehicle for a test drive to assess acceleration and throttle response.