how to fix P0300 random misfire code on Ford F-150 13th Generation (2015-2020)

Learn how to diagnose and fix P0300 random misfire in Ford F-150 (2015-2020). Step-by-step guide with diagnostic procedures and repair instructions.

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Disconnect the battery to ensure safety while working on electrical components.

2. Replace Spark Plugs

• Remove the engine cover if applicable.
• Using a socket wrench, remove the spark plug wires or ignition coils.
• Remove the old spark plugs using a spark plug socket. Inspect them for signs of wear or fouling.
• Install new spark plugs (recommended gap: 0.054 inches) and torque them to the manufacturer’s specifications (typically 11-15 ft-lbs).
• Reattach ignition coils or spark plug wires.

3. Inspect and Replace Ignition Coils (if necessary)

• If ignition coils are found defective, remove the bolts securing each coil.
• Disconnect the electrical connectors from the ignition coils.
• Install new ignition coils by reversing the removal steps and ensuring they are properly seated.

4. Check and Replace Fuel Injectors (if necessary)

• If fuel injectors are found faulty, relieve the fuel system pressure by removing the fuel pump fuse and starting the engine until it stalls.
• Disconnect the fuel lines and electrical connectors from the fuel injectors.
• Remove the old injectors from the fuel rail by releasing any retaining clips.
• Install the new injectors with new O-rings and reconnect the fuel lines and electrical connectors.

5. Inspect for Vacuum Leaks

• Visually inspect all vacuum hoses and joints in the intake system for cracks or disconnections.
• Use a smoke machine or carburetor cleaner to check for vacuum leaks while the engine is running.
• Replace any damaged vacuum lines or repair any leaks found.