how to fix the P0300 misfire code in my Genesis G70 IG (2017-2023)?

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Disconnect the negative battery terminal to prevent electrical shock.
• Allow the engine to cool completely before beginning work.

2. Replace Spark Plugs

• Remove the engine cover if applicable.
• Unplug the ignition coils from each spark plug.
• Use a socket set to carefully remove the spark plugs.
• Inspect the old spark plugs for signs of wear or fouling.
• Install new spark plugs, ensuring they are gapped correctly per manufacturer specifications.
• Torque the spark plugs to the recommended specification (usually around 13-15 lb-ft).

3. Test and Replace Ignition Coils (if necessary)

• Use a multimeter to test the primary and secondary resistance of each ignition coil.
• Replace any faulty coils with new ones.
• Reinstall the ignition coils and ensure all electrical connectors are secure.

4. Inspect and Clean Fuel Injectors

• Remove the fuel rail to access the injectors.
• Use a fuel injector cleaning kit to clean the injectors or replace them if they are damaged.
• Reinstall the fuel rail, ensuring proper sealing and connections.

5. Check for Vacuum Leaks

• Inspect all vacuum hoses and connections for cracks or disconnections.
• Use a smoke machine or carburetor cleaner to identify leaks by monitoring engine RPM changes.
• Replace any damaged hoses or seals.

6. Conduct a Compression Test

• Remove spark plugs again to access cylinders.
• Insert a compression gauge into each cylinder and crank the engine.
• Compare results against manufacturer specifications; replace or repair as necessary.