how to diagnose a P0301 misfire code on my Ford F-150 Fourteenth Generation (2021-present)

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery to ensure safety during repairs.

2. Inspect and Replace Spark Plug

• Remove the ignition coil from cylinder 1:
  • Disconnect the electrical connector from the ignition coil.
  • Remove the mounting bolt using a socket set.
• Extract the spark plug using a spark plug socket:
  • Inspect the spark plug for wear or deposits. Replace if necessary.
  • Set the new spark plug gap according to manufacturer specifications.
  • Install the new spark plug and torque it to the manufacturer’s specifications (usually around 13 lb-ft).
• Reinstall the ignition coil and reconnect the electrical connector.

3. Check and Replace Ignition Coil

• If the spark plug is fine, remove the ignition coil from cylinder 1 again.
• Test the ignition coil using a multimeter to check for proper resistance.
• If the coil is faulty, replace it with a new one, following the same installation steps.

4. Compression Test

• Reconnect the battery and perform a compression test:
  • Remove the spark plug from cylinder 1.
  • Insert the compression tester and crank the engine.
  • Record the compression reading; it should be within the manufacturer’s specifications.
• If compression is low, further investigation may be required for internal engine issues.

5. Fuel Injector Inspection

• Disconnect the fuel injector connector for cylinder 1.
• Use a multimeter to check for proper voltage at the connector while cranking the engine.
• If voltage is present, remove and inspect the fuel injector for clogs or damage.
• Clean or replace the fuel injector as necessary.