how to fix P0301 misfire code on Ford Explorer Fifth Generation (2011-2019)?

Solution

1. Preparation

• Gather all necessary tools and parts.
• Disconnect the negative battery terminal to prevent electrical shorts.
• Allow the engine to cool before starting work.

2. Replace Spark Plug and Ignition Coil

• Tools Required: Socket set, torque wrench, dielectric grease, replacement spark plug, ignition coil.
• Remove the engine cover if applicable.
• Disconnect the electrical connector from the ignition coil for cylinder 1.
• Remove the ignition coil bolt and carefully pull the coil out.
• Remove the spark plug using a spark plug socket and inspect for wear or fouling.
• Install the new spark plug and torque it to the manufacturer specification (typically around 13-15 lb-ft).
• Apply dielectric grease to the new ignition coil's terminal and install it, securing it with the bolt.

3. Inspect and Repair Vacuum Leaks

• Tools Required: Smoke machine or carburetor cleaner.
• With the engine running, use a smoke machine to check for vacuum leaks or spray carburetor cleaner around the intake manifold and vacuum hoses. A change in RPM indicates a leak.
• Repair any identified leaks by replacing gaskets or hoses as needed.

4. Check and Replace Fuel Injector (if necessary)

• Tools Required: Fuel pressure gauge, injector puller (if needed).
• Disconnect the fuel injector connector for cylinder 1.
• Measure the fuel pressure using a gauge to ensure it meets specifications.
• If the injector is faulty, remove it using an injector puller and install a new one, ensuring proper seating and connection.