how to fix a misfire in my Ford F-150 13th Generation (2015-2020) with error code P0302

Solution

1. Preparation

• Gather tools and parts.
• Disconnect the negative battery terminal to ensure safety.
• Allow the engine to cool if it has been running.

2. Inspect and Replace Spark Plug

• Tools Required: Socket set, torque wrench.
• Remove the ignition coil from cylinder 2:
  1. Disconnect the electrical connector from the ignition coil.
  2. Remove the mounting bolts using a socket set.
  3. Pull the ignition coil out carefully.
• Remove the spark plug:
  1. Use a spark plug socket to unscrew the spark plug from cylinder 2.
  2. Inspect the spark plug for wear, carbon buildup, or damage.
• Replace the spark plug if necessary:
  1. Install the new spark plug by hand to avoid cross-threading.
  2. Torque the spark plug to the manufacturer's specification (typically 13-15 lb-ft).
• Reinstall the ignition coil:
  1. Place the ignition coil back into its position.
  2. Secure it with the mounting bolts and reconnect the electrical connector.

3. Test and Replace Ignition Coil (if needed)

• Tools Required: Multimeter.
• Check the ignition coil’s resistance:
  1. Disconnect the ignition coil from the electrical connector.
  2. Use a multimeter to check the primary and secondary resistance according to the specifications found in the service manual.
• Replace the ignition coil if it is out of specification:
  1. Follow the same steps as above to remove and install the new ignition coil.

4. Inspect and Clean/Replace Fuel Injector (if needed)

• Tools Required: Fuel injector removal tools, cleaning kit.
• Remove the fuel injector for cylinder 2:
  1. Disconnect the fuel injector electrical connector.
  2. Remove the retaining clips and carefully pull the injector out.
• Clean the injector with a cleaning kit or replace it if clogged:
  1. If cleaning, follow the manufacturer’s instructions.
  2. If replacing, install the new injector ensuring proper seating.
• Reinstall the injector and reconnect the electrical connector.