how to fix P0300 misfire code on Ford F-150 13th Generation (2015-2020)

Learn how to diagnose and fix P0300 engine misfire in Ford F-150 (2015-2020). Step-by-step guide with diagnostic procedures and repair instructions.

Solution

1. Preparation

• Gather tools and parts needed for repair.
• Disconnect the battery to prevent electrical issues.
• Ensure the vehicle is on a flat surface and securely raised if necessary.

2. Inspect and Replace Spark Plugs

• Tools Required: Socket set, torque wrench
• Sub-steps:
  1. Remove the ignition coil covers if applicable.
  2. Disconnect the ignition coils from the spark plugs.
  3. Remove the old spark plugs using a spark plug socket.
  4. Inspect the old spark plugs for wear. Replace if worn or fouled.
  5. Install new spark plugs, torquing them to manufacturer specifications (typically 13 lb-ft).
  6. Reconnect the ignition coils.

3. Inspect and Replace Ignition Coils

• Tools Required: Socket set, torque wrench
• Sub-steps:
  1. Remove the ignition coils from the spark plugs after removing any necessary covers.
  2. Inspect the ignition coils for cracks or signs of failure.
  3. Replace any defective ignition coils with new ones.
  4. Reinstall the coils and secure them with the appropriate torque.

4. Fuel System Inspection

• Tools Required: Fuel pressure gauge
• Sub-steps:
  1. Locate the fuel rail and connect the fuel pressure gauge.
  2. Turn the ignition to the "On" position (do not start) to check fuel pressure.
  3. Ensure it meets the specifications outlined in the service manual (typically 50-60 psi for F-150).
  4. If the pressure is low, check the fuel pump and fuel filter, replacing them if necessary.

5. Compression Test

• Tools Required: Compression tester
• Sub-steps:
  1. Remove spark plugs to access the cylinder heads.
  2. Insert the compression tester into the spark plug hole of the first cylinder.
  3. Crank the engine and record the compression reading.
  4. Repeat for all cylinders and compare results; low compression may indicate internal engine problems.