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

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

Solution

1. Preparation

• Gather all necessary tools and parts.
• Ensure the vehicle is parked on a flat surface and the engine is cool.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Replace Ignition Components

1. Remove Engine Cover (if equipped)

   • Use a socket set to remove any screws or bolts holding the engine cover.
   • Carefully lift off the cover and set it aside.

2. Replace Spark Plugs

   • Use a spark plug socket and ratchet to remove old spark plugs.
   • Inspect the old plugs for signs of wear or fouling.
   • Install new spark plugs by hand to prevent cross-threading, then torque them to the manufacturer’s specifications (usually around 13-15 lb-ft).

3. Replace Ignition Coils

   • Disconnect the electrical connector from each ignition coil.
   • Remove the mounting bolts using a socket set.
   • Replace with new ignition coils and securely fasten them with bolts.
   • Reconnect the electrical connectors.

3. Check Fuel System

• Inspect Fuel Injectors

  • Remove the fuel rail if necessary and inspect injectors for clogs or leaks.
  • Clean or replace clogged injectors as needed.

• Test Fuel Pump

  • Connect a fuel pressure gauge to the fuel rail and turn the ignition on (do not start the engine) to check the pressure.
  • If pressure is below specifications, consider replacing the fuel pump.

4. Inspect Intake System

• Check for Vacuum Leaks
  • Visually inspect all hoses and connections for cracks or disconnections.
  • Use a smoke machine or carburetor cleaner to detect leaks around the intake manifold.

5. Reassemble and Reconnect

• Reinstall any components removed during the repair process.
• Reconnect the negative battery terminal.