how to troubleshoot the engine misfire on Ford Explorer Fifth Generation (2011-2019)

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a flat surface and the engine is cool.
• Disconnect the battery to ensure safety while working on electrical components.

2. Replace Spark Plugs

• Remove the ignition coil cover if necessary to access the spark plugs.
• Use a spark plug socket to remove the old spark plugs.
• Inspect the condition of the old plugs; replace with new plugs if worn or fouled to the specified gap (0.054 inches for the 3.5L engine).
• Torque new spark plugs to the manufacturer’s specification (typically 12-15 lb-ft).

3. Inspect and Replace Ignition Coils

• Disconnect the wiring harness from the ignition coils.
• Remove the bolts securing the ignition coils and carefully pull them out.
• Visually inspect for cracks or damage; replace any faulty coils with OEM parts.
• Reinstall new ignition coils and reconnect the wiring harness.

4. Test and Clean Fuel Injectors

• Remove fuel injectors from the fuel rail (ensure fuel pressure is released first).
• Inspect for clogs or leaks; clean using an ultrasonic cleaner or replace if necessary.
• Reinstall the injectors ensuring O-rings are intact.

5. Check Air Intake System

• Inspect the air filter and replace if dirty.
• Check intake hoses and gaskets for leaks or cracks; replace if needed.
• Ensure the Mass Air Flow (MAF) sensor is clean and functioning properly.