how to fix P0305 misfire code in Ford F-150 Fourteenth Generation (2021-present)

Learn how to diagnose and fix P0305 cylinder 5 misfire in Ford F-150. Step-by-step guide with diagnostic procedures and repair instructions.

Solution

1. Preparation

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

2. Remove Ignition Coil

• Locate the ignition coil for cylinder 5 (refer to the vehicle's service manual for exact location).
• Unplug the electrical connector from the ignition coil.
• Remove the retaining bolts using a socket set (typically 8 mm or 10 mm).
• Carefully pull the ignition coil out of the spark plug well.

3. Replace Spark Plug

• Using a spark plug socket, remove the spark plug from cylinder 5.
• Inspect and clean the spark plug well; replace with a new spark plug that meets manufacturer specifications (typically Motorcraft or equivalent).
• Torque the new spark plug to the manufacturer’s specification, usually around 13-15 lb-ft.

4. Inspect and Replace Fuel Injector (if needed)

• If the fuel injector is faulty, disconnect the electrical connector and fuel line.
• Remove the retaining clips and pull the injector out of the intake manifold.
• Install a new fuel injector, ensuring to apply a small amount of engine oil to the O-ring for a proper seal.
• Reconnect the fuel line and electrical connector securely.

5. Reinstall Ignition Coil

• Place the ignition coil back into its position over the new spark plug.
• Reinstall the retaining bolts and tighten them to the manufacturer’s torque specification.
• Reconnect the electrical connector to the ignition coil.

6. Reconnect Battery and Test

• Reconnect the negative battery terminal.
• Start the engine and monitor for any check engine light or misfire symptoms.