how to troubleshoot engine misfire P0301 in Ford Explorer Fifth Generation (2011-2019)

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Disconnect the negative battery cable to prevent electrical shorts.
• Allow the engine to cool down before proceeding.

2. Replace Spark Plug

• Tools Required: Socket set, torque wrench, spark plug socket.
• Remove the ignition coil from cylinder 1 by unbolting it and disconnecting the electrical connector.
• Use a spark plug socket to remove the old spark plug.
• Inspect the spark plug hole for debris and clean if necessary.
• Install a new spark plug, ensuring it is gapped correctly (check manufacturer specifications).
• Torque the spark plug to the manufacturer’s specifications (typically between 12-15 ft-lbs).

3. Test or Replace Ignition Coil

• Tools Required: Multimeter.
• Measure the resistance of the ignition coil using a multimeter. Compare readings to manufacturer specifications.
• If out of specification, replace the ignition coil with a new one.
• Reinstall the ignition coil securely and reconnect the electrical connector.

4. Inspect and Clean Fuel Injector

• Tools Required: Fuel injector cleaner kit or replacement injector.
• If the injector is clogged, either clean it using a fuel injector cleaner or replace it with a new injector.
• Reconnect all lines and ensure they are secure.

5. Perform Compression Test

• Tools Required: Compression tester.
• Remove the spark plug from cylinder 1 and insert the compression tester.
• Crank the engine several times to obtain a reading.
• Compare the reading with manufacturer specifications; if low, further investigation into the engine's internal components may be required.