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

Learn how to diagnose and fix P0300 engine misfire in Ford F-150 (2021-present). Step-by-step guide with diagnostic procedures and repair instructions.

Solution

1. Preparation

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

2. Inspect and Replace Spark Plugs

• Remove the ignition coil cover using a socket set.
• Disconnect the electrical connectors from each ignition coil.
• Remove the ignition coils using a socket set.
• Remove the spark plugs using a spark plug socket. Inspect for signs of wear or fouling.
• Install new spark plugs (manufacturer recommended type), torque to specification (typically 13-15 lb-ft).

3. Check and Replace Ignition Coils

• If any ignition coils show signs of failure, replace them.
• Ensure new coils are compatible with the vehicle model.
• Reinstall the ignition coils and reconnect the electrical connectors.

4. Inspect Fuel Injectors

• Use a fuel pressure gauge to check the fuel pressure in the rail.
• If pressure is outside of the specified range, check the fuel pump and filter for clogs.
• Remove and clean or replace any faulty fuel injectors.

5. Check for Vacuum Leaks

• Visually inspect all vacuum lines for cracks or disconnections.
• Use carburetor cleaner to spray around the intake manifold while the engine runs; a change in RPM indicates a leak.
• Replace any leaking vacuum lines and ensure all connections are tight.

6. Conduct Compression Test

• Remove spark plugs to access the cylinders.
• Use a compression tester to measure the pressure in each cylinder.
• Compare readings to manufacturer specifications; replace engine components if any cylinder is significantly low.