what does it mean if my Ford F-150 14th Generation (2021-2024) is showing P0301?

Solution

1. Preparation

• Gather necessary tools: OBD-II scanner, spark plug socket, torque wrench, compression tester, fuel injector cleaner.
• Ensure the vehicle is parked on a level surface and the engine is cool.

2. Inspect and Replace Spark Plug

• Sub-steps:
  1. Disconnect the negative battery terminal.
  2. Remove the ignition coil from cylinder 1 by unbolting and disconnecting the electrical connector.
  3. Use a spark plug socket to remove the spark plug from cylinder 1.
  4. Inspect the spark plug for signs of wear or fouling.
  5. Replace with a new spark plug that meets OEM specifications (typically a Motorcraft SP-534).
  6. Torque the new spark plug to the manufacturer-recommended specification (usually around 13 lb-ft).

3. Test and Replace Ignition Coil (if necessary)

• Sub-steps:
  1. Swap the ignition coil from cylinder 1 with another cylinder (e.g., cylinder 2).
  2. Reconnect the negative battery terminal and start the engine.
  3. If the misfire code shifts to the new cylinder, replace the ignition coil.
  4. If the problem persists, proceed to inspect the fuel injector.

4. Check and Clean Fuel Injector

• Sub-steps:
  1. Disconnect the fuel injector connector for cylinder 1.
  2. Use a fuel injector cleaner and follow the manufacturer's instructions to clean the injector.
  3. Reconnect the injector and perform a functional test to ensure proper operation.

5. Compression Test (if misfire persists)

• Sub-steps:
  1. Remove the spark plug from cylinder 1 again.
  2. Insert the compression tester into the spark plug hole.
  3. Crank the engine and record the compression reading.
  4. Compare the reading to the manufacturer’s specifications (usually around 120-220 psi).
  5. If compression is low, further investigation may be needed for internal engine issues.