how to fix P0304 misfire code in Genesis G70 IG (2017-2023)

Learn how to diagnose and fix P0304 cylinder 4 misfire in Genesis G70 (2017-2023). Step-by-step guide with diagnostic procedures and repair instructions.

Solution

1. Preparation

• Gather tools and parts required for repair.
• Disconnect the negative battery terminal to ensure safety during repairs.
• Allow the engine to cool before starting work.

2. Replace Spark Plug

• Tools Required: Socket set, torque wrench, spark plug socket.
• Remove the ignition coil from cylinder 4 by unscrewing the bolts and disconnecting the electrical connector.
• Use the spark plug socket to remove the spark plug from cylinder 4.
• Inspect the new spark plug and ensure it matches the specifications for the Genesis G70 (usually a NGK or Denso brand).
• Apply anti-seize compound on the threads of the new spark plug.
• Install the new spark plug and torque it to the manufacturer's specifications (typically around 13-15 lb-ft).
• Reinstall the ignition coil and reconnect the electrical connector.

3. Replace Ignition Coil (if faulty)

• If the ignition coil was found faulty during diagnostics, replace it.
• Remove the old ignition coil and install the new coil, ensuring it is seated properly.
• Reconnect the electrical connector.

4. Inspect/Replace Fuel Injector (if necessary)

• Disconnect the fuel line and electrical connector from the injector in cylinder 4 (ensure to relieve fuel pressure beforehand).
• Remove the fuel injector and inspect for clogs or damage.
• Replace with a new injector if necessary, ensuring proper seating and connection.

5. Check Compression (if needed)

• If compression is low, consider further diagnosis for possible internal engine issues, which may require more extensive repairs.