how to fix P0300 random misfire code in Ford Explorer Fifth Generation (2011-2019)

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a level surface and the engine is cool.
• Disconnect the battery before starting any electrical work.

2. Replace Spark Plugs

• Remove the engine cover if necessary.
• Disconnect ignition coil connectors (use a flat-head screwdriver if needed).
• Remove ignition coils using a socket set.
• Unscrew and remove old spark plugs using a spark plug socket.
• Check the gap on new spark plugs and adjust to manufacturer specifications.
• Install new spark plugs and torque to 13 lb-ft.
• Reinstall ignition coils and reconnect connectors.

3. Inspect and Replace Ignition Coils

• If the ignition coils are found defective during the inspection:
  • Disconnect the battery again for safety.
  • Remove the faulty ignition coils.
  • Install new ignition coils and torque to manufacturer specifications.
  • Reconnect the battery.

4. Fuel System Check

• If fuel injectors are suspected:
  • Disconnect the fuel line and relieve fuel pressure using a fuel pressure gauge.
  • Remove fuel injectors from the intake manifold.
  • Clean or replace injectors as necessary.
  • Reinstall injectors and reconnect the fuel line.

5. Vacuum Leak Inspection

• Inspect all vacuum hoses connected to the intake manifold.
• Replace any damaged or worn hoses.
• Use a smoke machine to locate hard-to-find leaks if necessary.