how to troubleshoot engine misfire P0301 in Genesis G70 IG (2017-2023)

Learn how to diagnose and fix P0301 cylinder 1 misfire in Genesis G70. Step-by-step guide with diagnostic procedures and repair instructions.

Solution

1. Preparation

• Gather tools and materials: OBD-II scanner, socket set, torque wrench, spark plug socket, compression tester, multimeter, and fuel injector cleaner.
• Ensure the vehicle is on a level surface and the engine is cool.

2. Replace Spark Plug

1. Disconnect the negative battery terminal to prevent electrical shock.
2. Remove the engine cover if applicable to access the ignition coil and spark plug.
3. Unplug the ignition coil connector and remove the ignition coil bolt using a socket.
4. Carefully pull out the ignition coil from the spark plug well.
5. Use a spark plug socket to remove the old spark plug from cylinder 1.
6. Inspect the spark plug for wear; if necessary, replace it with a new spark plug (ensure correct gap as per manufacturer specifications).
7. Install the new spark plug and torque it to the manufacturer's specifications (usually around 13-15 lb-ft).
8. Reinstall the ignition coil and secure it with the bolt, reconnecting the electrical connector.

3. Replace Ignition Coil (if faulty)

1. If the ignition coil is suspected to be faulty (after testing), purchase a new ignition coil compatible with the Genesis G70.
2. Follow steps 1-4 from the spark plug replacement.
3. Install the new ignition coil in place and secure it.
4. Reconnect the electrical connector.

4. Clean or Replace Fuel Injector

1. If the fuel injector is suspected to be clogged or faulty, disconnect the fuel line and electrical connector.
2. Remove the fuel injector from the rail (may require specific tools).
3. Clean the injector using a fuel injector cleaner or replace it with a new one.
4. Reinstall the injector ensuring O-rings are properly seated.