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

Solution

1. Preparation

• Gather tools and parts required for repair.
• Disconnect the negative battery terminal to ensure safety during repairs.

2. Inspect and Replace Spark Plug

• Tools Required: Socket set, torque wrench, spark plug socket.
• Remove the ignition coil by unscrewing the mounting bolts and disconnecting the electrical connector.
• Remove the spark plug using a spark plug socket and inspect for wear or damage.
• Replace with a new spark plug, ensuring it is gapped to specifications (typically 0.054 inches for this model).
• Reinstall the ignition coil, securing it with mounting bolts.

3. Test and Replace Ignition Coil (if necessary)

• Tools Required: Multimeter.
• Test the ignition coil’s resistance using a multimeter. Compare readings against manufacturer specifications (usually between 0.5 to 1.5 ohms).
• If readings are out of spec, replace the ignition coil with a new one, ensuring proper connection and securing it into place.

4. Inspect Fuel Injector

• Tools Required: Fuel injector removal tool, torque wrench.
• Disconnect the fuel injector electrical connector and fuel line (using caution to avoid fuel spillage).
• Remove the fuel injector and inspect for clogs or damage.
• Clean or replace the injector as necessary. Reinstall the injector and reconnect the fuel line and electrical connector.

5. Perform a Compression Test

• Tools Required: Compression tester.
• Remove the spark plug from cylinder 1 and install the compression tester in its place.
• Crank the engine and record the compression reading. Compare with manufacturer specifications (typically around 150 psi).
• If compression is low, investigate further for potential internal engine issues.

6. Check for Vacuum Leaks

• Tools Required: Smoke machine or carburetor cleaner.
• Use a smoke machine to pressurize the intake system and look for smoke escaping from any leaks.
• Alternatively, spray carburetor cleaner around the intake manifold and listen for changes in engine RPM, indicating a leak.
• Repair any leaks found by replacing gaskets or hoses.