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

Solution

1. Preparation

• Gather tools and parts needed.
• Disconnect the negative battery terminal to prevent electrical shock.
• Ensure the engine is cool before starting work.

2. Replace Spark Plugs

• Remove the ignition coils by unbolting and disconnecting the electrical connectors.
• Use a spark plug socket to carefully unscrew and remove the old spark plugs.
• Inspect the spark plug gaps; adjust or replace with new spark plugs as per manufacturer specifications.
• Install new spark plugs, ensuring proper torque (typically around 13-15 lb-ft).
• Reinstall the ignition coils and reconnect electrical connectors.

3. Inspect and Replace Ignition Coils

• Test each ignition coil with a multimeter for resistance; replace any that do not meet specifications.
• To replace, unbolt and disconnect the faulty ignition coil.
• Install the new coil, ensuring it is securely fastened and connected.

4. Check Fuel System

• Inspect the fuel filter; replace if it has not been serviced according to maintenance schedule.
• Test the fuel pressure using a fuel pressure gauge; replace the fuel pump if pressure is below specifications.

5. Inspect Vacuum Leaks

• Visually inspect vacuum hoses for cracks or disconnections; replace as necessary.
• Use a smoke test or carb cleaner to identify any leaks around the intake manifold.