how to fix the P0301 misfire code on my Ford Mustang S650 (2024-Present)

Solution

1. Preparation

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

2. Inspect and Replace Spark Plug

• Remove the ignition coil from cylinder 1 using a socket wrench.
• Take out the spark plug using a spark plug socket.
• Inspect the spark plug for wear, carbon deposits, or damage.
  • If damaged, replace with a new spark plug (refer to manufacturer specifications for gap settings).
• Reinstall the spark plug and torque it to the specified value (usually around 12-15 lb-ft).

3. Test and Replace Ignition Coil

• Test the ignition coil with a multimeter for proper resistance (refer to specific resistance values in the service manual).
  • If out of specification, replace the ignition coil.
• Reinstall the ignition coil and ensure all connections are secure.

4. Inspect and Clean Fuel Injector

• Remove the fuel injector from cylinder 1 after disconnecting the fuel rail.
• Clean the injector using an injector cleaner or replace it if necessary.
• Reinstall the fuel injector, ensuring proper seating and connection.

5. Compression Test

• Reconnect all components and conduct a compression test on cylinder 1.
  • If compression is low, further engine diagnostics may be needed (potential valve or piston issues).

6. Final Checks

• Reconnect the negative battery terminal.
• Clear the trouble codes using an OBD-II scanner and perform a test drive to verify repairs.