how to fix P0301 misfire code in Ford Explorer Sixth Generation (2020-present)?

Solution

1. Preparation

• Gather tools and parts.
• Disconnect the negative battery terminal.
• Allow the engine to cool completely before working.

2. Replace Spark Plug

• Sub-steps:
  • Remove the engine cover if applicable (socket set may be required).
  • Disconnect the ignition coil connector from the coil on cylinder 1.
  • Remove the ignition coil by unscrewing it from the cylinder head.
  • Use a spark plug socket to unscrew and remove the old spark plug.
  • Inspect the spark plug socket for debris and clean if necessary.
  • Install the new spark plug, ensuring the correct gap (typically 0.028-0.032 inches for Ford engines).
  • Torque the spark plug to the manufacturer's specification (usually around 13-15 lb-ft).
  • Reinstall the ignition coil and connector.

3. Test Ignition Coil

• Sub-steps:
  • If you suspect the ignition coil is faulty, test it with a multimeter.
  • Measure the primary resistance between the terminals (should be within manufacturer's specifications).
  • If faulty, replace with a new ignition coil, ensuring proper seating and connection.

4. Inspect or Replace Fuel Injector

• Sub-steps:
  • Remove the fuel rail if necessary to access the injector.
  • Disconnect the fuel injector connector.
  • Check for signs of leakage or clogs.
  • If the injector is defective, replace it with a new one, ensuring proper seating and connection.

5. Verify Compression

• Sub-steps:
  • Remove the spark plug from cylinder 1 and the ignition coil.
  • Insert a compression gauge into the spark plug hole.
  • Crank the engine and record the compression reading.
  • Compare the reading to the manufacturer's specifications (usually around 150-200 psi).
  • If compression is low, further investigate for head gasket failure or internal damage.