how to fix P0300 random misfire code in 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.
• Disconnect the negative battery terminal to prevent electrical shorts.
• Ensure the engine is cool before beginning work.

2. Replace Spark Plugs

• Tools Required: Socket set, torque wrench, spark plug socket, anti-seize compound.
• Remove the ignition coil packs using a socket wrench.
• Unscrew and remove the old spark plugs with a spark plug socket.
• Inspect the condition of the spark plug terminals and replace with new spark plugs, applying anti-seize compound on threads.
• Torque the new spark plugs to the manufacturer's specifications (usually around 13-15 lb-ft).

3. Inspect and Replace Ignition Coils

• Tools Required: Socket set, torque wrench.
• Remove the ignition coils from the spark plugs.
• Test each ignition coil with a multimeter (should read within manufacturer specifications).
• Replace any faulty ignition coils with new ones, ensuring they are seated properly.
• Torque the ignition coil bolts to manufacturer specifications (usually around 7-10 lb-ft).

4. Clean or Replace Fuel Injectors

• Tools Required: Fuel injector cleaning kit or replacement injectors, fuel pressure gauge.
• Remove the fuel rail to access the injectors.
• Clean the injectors using a cleaning kit, or replace them if they are clogged.
• Reinstall the fuel rail and ensure all connections are secure.

5. Inspect MAF Sensor

• Tools Required: MAF cleaner spray.
• Disconnect the MAF sensor harness and remove the sensor.
• Clean the sensor with MAF cleaner spray and allow it to dry.
• Reinstall the MAF sensor and reconnect the harness.

6. Check for Vacuum Leaks

• Inspect all vacuum hoses visually and listen for hissing sounds.
• Replace any damaged or cracked hoses.