how to fix the engine misfire in my BMW 5 Series G30/G31 (2017-2024)

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery to prevent electrical shorts.
• Allow the engine to cool down before working.

2. Replace Spark Plugs

• Tools Required: Socket set, torque wrench, spark plug socket.
• Remove the engine cover if necessary.
• Disconnect the ignition coils from the spark plugs.
• Use the spark plug socket to carefully remove old spark plugs.
• Inspect the spark plug gap; replace with new plugs if they are worn or out of specification.
• Install the new spark plugs, tightening them to the manufacturer's specified torque (typically around 22 Nm).
• Reconnect the ignition coils.

3. Replace Ignition Coils

• Tools Required: Socket set, torque wrench.
• Remove the ignition coils by unscrewing the retention bolts.
• Inspect the connectors for corrosion and clean if necessary.
• Install new ignition coils, ensuring they are seated properly.
• Tighten to the manufacturer’s specified torque (typically around 10 Nm).

4. Clean or Replace Fuel Injectors

• Tools Required: Fuel injector cleaning kit or replacement injectors.
• If cleaning, connect the injector cleaning kit and follow the manufacturer’s instructions to clean.
• If replacing, disconnect the fuel line and harness from each injector.
• Remove the old injectors and install new ones, ensuring proper seating and sealing.

5. Check and Repair Vacuum Leaks

• Tools Required: Smoke machine or vacuum gauge.
• Use a smoke machine to detect leaks in the intake system.
• Repair or replace any damaged hoses or components as identified.

6. Test Engine Compression

• Tools Required: Compression tester.
• Remove spark plugs and insert the compression tester into each cylinder.
• Crank the engine and record the compression readings.
• Compare readings with manufacturer specifications; replace any components as necessary.