how to fix P0301 misfire code in Ford F-150 12th Generation (2009-2014)

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery cable to prevent electrical shorts.

2. Replace Spark Plug

• Tools Required: Spark plug socket, ratchet, torque wrench
• Remove the ignition coil from cylinder 1:
  1. Disconnect the electrical connector.
  2. Remove the mounting bolts.
  3. Pull the coil out gently.
• Remove the spark plug using the spark plug socket.
• Inspect the spark plug for fouling or wear and replace it with a new spark plug, ensuring it is gapped according to manufacturer specifications (typically 0.054 inches for this model).
• Torque the new spark plug to the manufacturer's specification (approximately 13 lb-ft).

3. Replace Ignition Coil (if necessary)

• If the ignition coil is faulty:
  1. Install a new ignition coil onto the spark plug.
  2. Reconnect the electrical connector and secure with the mounting bolts.

4. Inspect Fuel Injector

• Check the fuel injector for cylinder 1:
  1. Disconnect the electrical connector from the injector.
  2. Use a noid light or multimeter to check for electrical signal.
  3. If no signal is detected, inspect wiring and connectors.
  4. If the injector is faulty, replace it and ensure proper seating.

5. Compression Test

• If misfire persists, perform a compression test:
  1. Remove the spark plug from cylinder 1.
  2. Insert the compression gauge into the spark plug hole.
  3. Crank the engine and record the reading.
  4. Compare the reading to manufacturer specifications (typically 125-175 psi). If low, further investigation of the engine internals may be required.