how can I check if my BMW 5 Series G30/G31 (2017-2024) has a faulty fuel injector?

Solution

1. Preparation

• Tools Required: OBD-II scanner, fuel pressure gauge, multimeter, socket set, injector puller (if necessary).
• Ensure the vehicle is parked on a flat surface with the engine off. Disconnect the battery to prevent any electrical shorts.

2. Remove Injectors

• Sub-steps:
  1. Remove the engine cover by unscrewing or unclipping it as necessary.
  2. Detach any components obstructing access to the fuel injectors (e.g., intake manifold, air ducts).
  3. Carefully disconnect the electrical connectors from each fuel injector.
  4. Remove the fuel rail bolts and gently pull the fuel rail away from the injectors.
  5. Use an injector puller if necessary to remove the injectors from the rail.

3. Inspect and Test Injectors

• Sub-steps:
  1. Visually inspect each fuel injector for signs of wear, cracks, or leaks.
  2. Use the multimeter to check the resistance of each injector coil; replace any injector with readings outside the specified range.
  3. Perform an ultrasonic cleaning or a flow test to assess injector performance and atomization quality.
  4. Replace any faulty injectors with new OEM or high-quality aftermarket parts.

4. Reassemble Components

• Sub-steps:
  1. Apply a small amount of engine oil to the O-rings of the new injectors for proper sealing.
  2. Insert the new or cleaned injectors back into the fuel rail and secure the fuel rail back onto the engine.
  3. Reconnect electrical connectors to each injector.
  4. Reinstall any components removed during the disassembly process, ensuring all bolts are torqued to specification.
  5. Reattach the engine cover.