my BMW 3 Series stalls when I come to a stop what could be the reason

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery to ensure safety during the repair.

2. Clean the Throttle Body

• Remove the air intake duct connected to the throttle body using a socket set.
• Spray throttle body cleaner onto a clean cloth and wipe the throttle plate and interior of the throttle body.
• Reattach the air intake duct and ensure it is securely fastened.

3. Replace the Fuel Filter (if applicable)

• Locate the fuel filter under the vehicle or in the engine bay.
• Use a socket set to remove the old fuel filter, ensuring to have a catch can for any spilling fuel.
• Install the new fuel filter in the correct direction (indicated by arrows on the filter) and tighten the fittings securely.

4. Inspect and Clean the Idle Air Control Valve

• Disconnect the electrical connector from the idle air control valve.
• Remove the valve from its housing using a socket set.
• Clean the valve with throttle body cleaner and a soft brush, ensuring no debris remains.
• Reinstall the valve and reconnect the electrical connector.

5. Check and Replace the MAF Sensor (if necessary)

• Locate the MAF sensor in the air intake path.
• Disconnect the wiring harness and remove the MAF sensor.
• Inspect the sensor for dirt or damage; if dirty, clean it with MAF cleaner. If damaged, replace it with a new sensor.
• Reinstall the MAF sensor and reconnect the wiring harness.