how to diagnose and fix Ford F-150 13th Generation (2015-2020) misfire issues

Solution

1. Preparation

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

2. Replace Spark Plugs

• Sub-steps:
  1. Remove the engine cover if applicable.
  2. Disconnect the ignition coils from the spark plugs.
  3. Use a socket wrench to remove the spark plugs.
  4. Inspect the condition of the old spark plugs.
  5. Install new spark plugs with the specified gap (typically 0.054 inches for F-150).
  6. Torque the spark plugs to manufacturer specifications (usually around 12-15 lb-ft).

3. Replace Ignition Coils

• Sub-steps:
  1. Remove the ignition coil connectors.
  2. Unbolt the ignition coils from the cylinder head.
  3. Install new ignition coils, ensuring they seat properly.
  4. Reconnect the ignition coil connectors.

4. Clean or Replace Fuel Injectors

• Sub-steps:
  1. Remove the intake manifold if necessary to access fuel injectors.
  2. Disconnect fuel injector connectors.
  3. Remove fuel rail bolts and carefully pull the fuel rail with injectors out.
  4. Clean the injectors with a solvent or replace them as needed.
  5. Reassemble the fuel rail and reconnect everything.

5. Check Fuel Pressure

• Sub-steps:
  1. Attach a fuel pressure gauge to the fuel rail test port.
  2. Turn the ignition on (do not start the engine) to check for correct fuel pressure (typically around 55-65 psi).
  3. Replace the fuel pump or filter if pressure is low.