why does my BMW 3 Series G20/G21 (2019-2024) have a delay when accelerating?

Solution

1. Preparation

• Gather necessary tools and parts, and ensure the vehicle is parked on a level surface.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Inspect and Clean Throttle Body

• Remove the air intake duct connected to the throttle body.
• Use throttle body cleaner and a clean cloth to gently scrub the throttle body, removing any carbon deposits.
• Reinstall the air intake duct securely.

3. Check and Replace Fuel Filter (if applicable)

• Locate the fuel filter in the fuel line (if external).
• Using a wrench, disconnect the fuel lines from the filter.
• Replace the old filter with a new one, ensuring proper orientation.
• Reconnect the fuel lines and check for leaks.

4. Test and Replace Mass Airflow Sensor

• Disconnect the electrical connector from the MAF sensor.
• Remove the MAF sensor from the air intake duct.
• Test the MAF sensor using a multimeter to ensure it is functioning correctly.
• If faulty, replace with a new MAF sensor and reconnect the electrical connector.

5. Inspect Air Intake System

• Visually inspect all hoses and connections for signs of wear or leaks.
• Replace any damaged hoses or clamps.

6. Check Transmission Fluid

• Locate the transmission dipstick and remove it.
• Check the fluid level and condition; it should be pink and translucent.
• If low or dirty, drain and replace the transmission fluid with the manufacturer's recommended type.