how to diagnose P0301 misfire code on Ford Mustang S650 (2024-Present)

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the vehicle's battery to prevent electrical shock.
• Allow the engine to cool down before beginning work.

2. Replace Spark Plug

• Remove the ignition coil from cylinder 1:
  • Unplug the electrical connector from the ignition coil.
  • Remove the bolts securing the coil and lift it out.
• Remove the spark plug:
  • Use a spark plug socket and ratchet to unscrew the spark plug from cylinder 1.
  • Inspect the spark plug for wear, deposits, or damage.
• Install a new spark plug:
  • Apply anti-seize compound to the threads (if recommended).
  • Torque the new spark plug to manufacturer specifications (usually around 13-15 lb-ft).

3. Replace Ignition Coil

• If the ignition coil was found defective during diagnostics:
  • Install the new ignition coil in its place.
  • Reconnect the electrical connector and secure it with bolts.

4. Check Fuel Injector

• If the fuel injector was suspected to be faulty:
  • Disconnect the fuel line and electrical connector from the fuel injector.
  • Remove the fuel injector from its rail.
  • Install a new fuel injector, ensuring proper seating.
  • Reconnect the fuel line and electrical connector.

5. Reassemble and Test

• Reconnect the battery.
• Start the engine and monitor for any misfire codes using the OBD-II scanner.
• Perform a test drive to ensure proper operation.