how to troubleshoot engine stalling in BMW 3 Series G20/G21 (2019-2024)

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery to prevent electrical shorts.
• Allow the engine to cool if previously running.

2. Fuel System Inspection

1. Check Fuel Pressure

   • Connect a fuel pressure gauge to the fuel rail service port.
   • Turn the ignition to the "On" position (without starting the engine) and check pressure readings against manufacturer specifications (typically around 50-60 psi).
   • If pressure is low, inspect the fuel pump, relay, and filter for issues.

2. Inspect Fuel Injectors

   • Remove the fuel injectors and check for clogs or leaks.
   • Clean or replace as necessary.

3. Air Intake System Inspection

1. Check Air Filter

   • Remove the air filter and inspect for dirt or blockages.
   • Replace with a new air filter if necessary.

2. Inspect MAF Sensor

   • Disconnect the MAF sensor connector and clean the sensor with MAF cleaner.
   • Reconnect and test for proper readings.

4. Ignition System Repair

1. Inspect Spark Plugs

   • Remove spark plugs and check for wear or fouling.
   • Replace any damaged plugs with OEM replacements.

2. Check Ignition Coils

   • Measure resistance on ignition coils using a multimeter.
   • Replace any coils that are out of specification.

5. Vacuum System Repair

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