how to fix P0300 random misfire code in Ford F-150 14th Generation (2021-2024)

Learn how to diagnose and fix P0300 random misfire in Ford F-150 14th Generation (2021-2024). Step-by-step guide with diagnostic procedures and repair instructions.

Solution

1. Preparation

• Tools Required: OBD-II scanner, socket set, multimeter, fuel pressure gauge, vacuum gauge.
• Disconnect the battery to prevent electrical shorts.
• Allow the engine to cool down before working on components.

2. Inspect and Replace Spark Plugs

• Remove the ignition coil cover using a socket set.
• Unscrew and remove the spark plugs using a spark plug socket.
• Inspect the spark plugs for wear or deposits; replace with OEM specifications if found faulty.
• Torque new spark plugs to manufacturer specifications (typically around 13-15 lb-ft).
• Reinstall the ignition coils and covers.

3. Check and Replace Ignition Coils

• Disconnect the electrical connector from each ignition coil.
• Remove the bolts securing the ignition coils and take them out.
• Test each coil with a multimeter for primary and secondary resistance; replace any that do not meet specifications.
• Install new coils, ensuring they are seated properly, and reconnect electrical connectors.

4. Inspect Fuel Injectors

• Remove the fuel rail assembly if needed to access fuel injectors.
• Check for clogs by performing a resistance test on each injector and cleaning or replacing as necessary.
• If injectors are clogged, use a fuel injector cleaning kit to flush them out.
• Reinstall the fuel rail and ensure all connections are secure.

5. Check for Vacuum Leaks

• Use a vacuum gauge to test for any leaks in the intake manifold and vacuum lines.
• Inspect hoses and gaskets for cracks or disconnections; replace any faulty components.
• After repairs, clear any error codes using the OBD-II scanner.