my BMW X3 G01 (2018-2024) is stalling at red lights what should I check

Solution

1. Preparation

• Gather tools: OBD-II scanner, fuel pressure gauge, socket set, multimeter, throttle body cleaner.
• Ensure the vehicle is parked on a level surface and the engine is off before beginning any repairs.

2. Check and Clean Throttle Body

• Sub-steps:
  1. Disconnect the negative battery terminal to prevent electrical shorts.
  2. Remove the air intake duct connected to the throttle body using a socket set.
  3. Inspect the throttle body for carbon buildup; if present, spray throttle body cleaner and gently scrub with a soft cloth.
  4. Reassemble the intake duct and reconnect the negative battery terminal.

3. Inspect and Test Fuel System

• Sub-steps:
  1. Connect a fuel pressure gauge to the fuel rail according to the manufacturer's specifications.
  2. Turn the ignition to the "ON" position without starting the engine and check the fuel pressure reading.
  3. If the pressure is below specifications, check the fuel pump and fuel filter for issues.
  4. Replace the fuel filter if it appears clogged and test the fuel pump for proper operation.

4. Check Idle Air Control or Electronic Throttle Control

• Sub-steps:
  1. Locate the idle air control valve or electronic throttle body according to the vehicle's service manual.
  2. Disconnect the connector and test the valve's operation with a multimeter to ensure it meets the specified resistance.
  3. If faulty, replace the valve or throttle body as needed, following the manufacturer’s torque specifications during reinstallation.