how to fix Ford F-150 13th Generation (2015-2020) P0304 engine misfire

Learn how to diagnose and fix P0304 engine misfire in Ford F-150 13th Generation (2015-2020). Step-by-step guide with diagnostic procedures and repair instructions.

Solution

1. Preparation

• Gather tools and parts.
• Ensure the vehicle is parked on a level surface and the engine is cool.
• Disconnect the battery to prevent any electrical shorts.

2. Replace Spark Plug

• Tools Required: Socket set, torque wrench, spark plug socket.
• Steps:
  1. Remove the engine cover if applicable.
  2. Disconnect the ignition coil connector for cylinder 4.
  3. Remove the ignition coil from cylinder 4 by unscrewing the retaining bolts.
  4. Remove the old spark plug using the spark plug socket and inspect it for wear.
  5. Install the new spark plug by hand to avoid cross-threading, then torque to manufacturer specifications (typically 13-16 lb-ft).
  6. Reinstall the ignition coil and reconnect the electrical connector.

3. Replace Ignition Coil

• Tools Required: Socket set, torque wrench.
• Steps:
  1. If necessary, remove the old ignition coil and install the new coil in the same position.
  2. Torque the ignition coil bolts to manufacturer specifications (typically around 10-12 lb-ft).
  3. Reconnect the ignition coil connector.

4. Clean or Replace Fuel Injector

• Tools Required: Fuel injector cleaning kit or replacement injector, safety goggles.
• Steps:
  1. Disconnect the fuel rail and remove the fuel injector from cylinder 4.
  2. Clean the injector using a cleaning kit or replace it with a new injector.
  3. Reinstall the fuel injector, ensuring it is seated properly in the fuel rail.

5. Reconnect Battery and Test

• Reconnect the battery terminals.
• Start the engine and observe for any misfire symptoms.