how to fix Ford F-150 14th Generation (2021-2024) with P0301 misfire code

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to prevent electrical shorts.
• Allow the engine to cool down before starting work.

2. Inspect and Replace Spark Plug

• Sub-steps:
  1. Remove the engine cover if applicable.
  2. Locate the spark plug for cylinder 1.
  3. Use a spark plug socket and ratchet to remove the old spark plug.
  4. Inspect the old spark plug for wear or damage.
  5. Install a new spark plug, ensuring to use the correct gap specification (usually 0.030 inches).
  6. Torque the spark plug to the manufacturer's specification (typically around 15 ft-lbs).

3. Check and Replace Ignition Coil

• Sub-steps:
  1. Disconnect the electrical connector from the ignition coil.
  2. Remove the mounting bolt(s) holding the ignition coil in place.
  3. Pull out the ignition coil from the cylinder head.
  4. Inspect for carbon tracking or damage.
  5. Install a new ignition coil, securing it with the mounting bolt(s) and reconnecting the electrical connector.

4. Inspect and Replace Fuel Injector

• Sub-steps:
  1. Disconnect the fuel line and electrical connector from the fuel injector for cylinder 1.
  2. Remove the injector retaining clips and carefully pull out the injector.
  3. Inspect the old fuel injector for clogs or damage.
  4. Install a new fuel injector, ensuring proper alignment and securing it with clips.
  5. Reconnect the fuel line and electrical connector.

5. Perform Compression Test

• Sub-steps:
  1. Remove all spark plugs to facilitate cranking.
  2. Insert the compression gauge into the spark plug hole of cylinder 1.
  3. Crank the engine and record the compression reading.
  4. Compare the reading against manufacturer specifications (approximately 90-120 psi).
  5. If the reading is low, further diagnostic is needed for possible internal engine issues.

Tools Required:

• OBD-II scanner
• Socket set (including spark plug socket)
• Torque wrench
• Compression gauge
• Fuel line removal tool
• Ratchet and extension

Parts Required:

• Spark plug (specific to engine model)
• Ignition coil (for cylinder 1)
• Fuel injector (for cylinder 1, if needed)

Estimated Repair Time: 2-4 hours

Safety Warnings:

• Disconnect the battery before working on electrical components.
• Allow the engine to cool before servicing to prevent burns.