how to fix P0305 code on 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 all necessary tools and parts.
• Disconnect the negative battery terminal to avoid electrical issues.
• Allow the engine to cool completely before starting work.

2. Replace Spark Plug

• Tools Required: Socket set, torque wrench, spark plug gap tool.
• Remove the engine cover if applicable.
• Locate the spark plug for cylinder 5.
• Use a socket wrench to remove the spark plug.
• Inspect and replace with a new spark plug, ensuring it is gapped correctly per manufacturer specifications.
• Torque the spark plug to the manufacturer's specified value (typically around 13-15 lb-ft).

3. Replace Ignition Coil

• Tools Required: Socket set.
• After removing the spark plug, disconnect the ignition coil connector.
• Remove the mounting bolts for the ignition coil.
• Replace the faulty coil with a new one, and reattach the connector securely.

4. Clean or Replace Fuel Injector

• Tools Required: Fuel injector cleaning kit or replacement injector.
• If cleaning, follow the cleaning kit instructions to service the injector.
• If replacing, disconnect the fuel line and electrical connector from the injector.
• Remove the old injector and install the new injector, ensuring a proper seal.

5. Check for Vacuum Leaks

• Tools Required: Smoke machine or carburetor cleaner.
• Visually inspect hoses connected to the intake manifold for cracks or disconnections.
• Use a smoke machine to find leaks or spray carburetor cleaner around suspected areas; if idle changes, a leak is present.
• Repair or replace any faulty hoses or gaskets.