how to fix P0303 misfire in my Ford F-150 14th Generation (2021-2024)?

Learn how to diagnose and fix P0303 cylinder 3 misfire in Ford F-150 (2021-2024). 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 down before proceeding.

2. Inspect and Replace Spark Plug

• Tools Required: Socket set, torque wrench, spark plug socket.
• Remove the ignition coil from cylinder 3 by unscrewing it and disconnecting the electrical connector.
• Take out the spark plug using a spark plug socket.
• Inspect the spark plug for signs of wear or fouling. Replace if necessary.
• Install the new spark plug and torque to manufacturer's specifications (typically around 13-15 lb-ft).

3. Inspect and Replace Ignition Coil

• Tools Required: Socket set, torque wrench.
• If the spark plug is in good condition, check the ignition coil for cylinder 3.
• Remove the ignition coil and visually inspect it for cracks or carbon tracking.
• Replace the ignition coil with a new one if damaged.
• Reinstall the ignition coil, ensuring it is securely fastened.

4. Check and Replace Fuel Injector (if needed)

• Tools Required: Fuel injector puller, socket set.
• Remove the intake manifold if necessary to access the fuel injector.
• Disconnect the fuel injector connector and fuel line (be cautious of fuel spray).
• Remove and inspect the fuel injector for blockage or damage. Replace it if found faulty.
• Reinstall the new or cleaned fuel injector and reconnect all lines and connectors.

5. Reconnect Battery and Clear Codes

• Reconnect the negative battery terminal.
• Use the OBD-II scanner to clear the P0303 code.