how to fix P0305 code in Ford F-150 12th Generation (2009-2014)

Learn how to diagnose and fix P0305 cylinder 5 misfire in Ford F-150 (2009-2014). Step-by-step guide with diagnostic procedures and repair instructions.

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a flat surface and the engine is off.
• Disconnect the battery to prevent electrical short circuits.

2. Replace Spark Plug

• Tools Required: Spark plug socket, ratchet, torque wrench, dielectric grease.
• Remove the spark plug wire or ignition coil from cylinder 5.
• Use the spark plug socket to remove the old spark plug.
• Inspect the new spark plug and apply dielectric grease to the boot.
• Install the new spark plug and torque it to the manufacturer's specification (typically around 13-15 lb-ft).
• Reconnect the spark plug wire or ignition coil.

3. Replace Ignition Coil

• Tools Required: Ratchet, socket set.
• Remove the bolt securing the ignition coil in cylinder 5.
• Disconnect the electrical connector from the ignition coil.
• Remove the ignition coil from the spark plug.
• Install the new ignition coil and reconnect the electrical connector.
• Reattach the securing bolt and tighten it to the specified torque.

4. Check Fuel Injector

• Tools Required: Fuel pressure gauge, injector cleaning kit (if necessary).
• Disconnect the fuel injector connector for cylinder 5.
• Use a fuel pressure gauge to test the fuel pressure.
• If low, check the fuel pump and fuel filter.
• If pressure is adequate but injector is suspected to be clogged, clean or replace the injector.

5. Inspect for Vacuum Leaks

• Tools Required: Smoke machine, vacuum gauge.
• Use a smoke machine to introduce smoke around the intake manifold and vacuum lines.
• Look for any smoke escaping, indicating a vacuum leak.
• Repair any damaged hoses or gaskets found.