how to troubleshoot the engine misfire in my Ford F-150 13th Generation (2015-2020)

Learn how to diagnose and fix engine misfire issues (P0300-P0308) in Ford F-150 (2015-2020). Step-by-step guide with diagnostic procedures and repair instructions.

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery to prevent electrical shorts.
• Ensure the engine is cool before starting work.

2. Replace Spark Plugs

• Remove the ignition coils using a socket set.
• Unscrew and remove the old spark plugs using a spark plug socket.
• Check and adjust the gap on new spark plugs to manufacturer's specifications.
• Install new spark plugs and torque them to the manufacturer's specified value (typically 13-15 ft-lbs).
• Reinstall the ignition coils.

3. Replace Ignition Coils (if needed)

• Disconnect the electrical connectors from the ignition coils.
• Remove the coils by unscrewing the mounting bolts.
• Install new ignition coils and secure them with bolts.
• Reconnect electrical connectors.

4. Inspect and Repair Fuel System (if needed)

• Connect a fuel pressure gauge to the fuel rail.
• Start the engine and monitor fuel pressure to ensure it meets specifications (usually around 30-60 psi).
• Replace the fuel filter if pressure is low, and check fuel injectors for proper operation.

5. Check for Vacuum Leaks

• Inspect all vacuum hoses for cracks, breaks, or disconnections.
• Use a smoke machine or carburetor cleaner to identify leaks around intake manifold and hoses.
• Replace any damaged hoses or components.