how to fix P0300 random misfire code in Ford F-150 Fourteenth Generation (2021-present)

Learn how to diagnose and fix P0300 random misfire in Ford F-150. Step-by-step guide with diagnostic procedures and repair instructions.

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery by removing the negative terminal to prevent electrical shocks.

2. Replace Spark Plugs

• Tools Required: Spark plug socket, ratchet, torque wrench, gap gauge.
• Remove the ignition coil(s) by unscrewing the retaining bolts and carefully pulling them off the spark plugs.
• Use the spark plug socket to remove the existing spark plugs.
• Check the gap on the new spark plugs using a gap gauge, set to manufacturer specifications.
• Install the new spark plugs and torque them to the manufacturer’s specifications (generally around 13-15 lb-ft).
• Reinstall the ignition coils.

3. Test and Replace Ignition Coils (if needed)

• Tools Required: Multimeter.
• Test each ignition coil's resistance using a multimeter; compare readings to manufacturer specifications.
• If any coils are out of spec, remove and replace them with new ones.
• Reconnect any electrical connectors.

4. Clean Fuel Injectors

• Tools Required: Fuel injector cleaning kit or professional cleaning service.
• Follow the manufacturer’s instructions on using the fuel injector cleaning kit.
• If using a professional service, ensure that the injectors are properly cleaned or replaced if they are faulty.

5. Inspect and Repair Vacuum Leaks

• Tools Required: Smoke machine or carburetor cleaner.
• Conduct a smoke test or spray carburetor cleaner around intake gaskets, vacuum hoses, and throttle body to identify leaks.
• Replace any damaged hoses or gaskets identified during inspection.