why does my BMW 3 Series F30/F31 (2012-2019) stall when I stop

Solution

1. Preparation

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

2. Clean or Replace Throttle Body

• Remove the intake duct to access the throttle body.
• Use throttle body cleaner and a soft cloth to clean the throttle plate and surrounding area.
• Reattach the intake duct securely.

3. Inspect and Replace Fuel Filter (if necessary)

• Locate the fuel filter; often found along the fuel line.
• Relieve fuel system pressure by removing the fuel pump fuse and starting the engine until it stalls.
• Disconnect fuel lines carefully and replace the filter with a new one, ensuring proper orientation.
• Reconnect the fuel pump fuse and check for leaks.

4. Test and Clean Idle Air Control Valve (IAC)

• Remove the IAC valve from its mounting position.
• Clean the valve and its passages using an appropriate cleaner.
• Reinstall the IAC valve and ensure it is securely fastened.

5. Address Vacuum Leaks

• Inspect all vacuum hoses for cracks or disconnections.
• Replace any damaged hoses to ensure proper engine vacuum levels.

6. Replace Spark Plugs (if necessary)

• Remove the ignition coil packs to access the spark plugs.
• Inspect the spark plugs for wear and replace them if needed, using the manufacturer’s recommended type and gap.
• Reinstall the ignition coil packs securely.