my BMW 3 Series F30/F31 (2012-2019) hesitates when I accelerate

Solution

1. Preparation

• Gather all necessary tools and parts before beginning the repair.
• Disconnect the battery to ensure safety while working on electrical components.

2. Inspect and Replace Spark Plugs

• Sub-steps:
  1. Remove the engine cover (if applicable) using a socket set.
  2. Disconnect ignition coil connectors, then remove coils by unscrewing them.
  3. Remove the old spark plugs using a spark plug socket.
  4. Inspect the spark plugs for signs of wear (carbon buildup, damage).
  5. Install new spark plugs, ensuring they are torqued to the manufacturer’s specifications (typically around 22 lb-ft).
  6. Reinstall ignition coils and reconnect connectors.

3. Test and Replace Fuel Filter

• Sub-steps:
  1. Locate the fuel filter, typically found along the fuel line.
  2. Disconnect the fuel lines using a line removal tool, ensuring to have a rag to catch any spillage.
  3. Remove the old fuel filter and install the new one, ensuring the flow direction matches the markings on the filter.
  4. Reconnect the fuel lines securely.

4. Check and Replace Air Filter

• Sub-steps:
  1. Locate the air intake box and remove the clips or screws securing it.
  2. Remove the old air filter and inspect the housing for debris.
  3. Install the new air filter, ensuring it is seated properly.
  4. Reattach the air intake box securely.

5. Verify Throttle Position Sensor Operation

• Sub-steps:
  1. Locate the throttle body and disconnect the throttle position sensor connector.
  2. Use a multimeter to check the voltage output of the sensor while operating the throttle.
  3. If readings are outside the manufacturer’s specifications, replace the throttle position sensor.