what could cause the engine to misfire in my Ford Explorer Sixth Generation (2020-present)

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Disconnect the negative battery terminal to ensure safety.
• Allow the engine to cool before starting work.

2. Replace Spark Plugs

• Sub-steps:
  1. Remove the ignition coils above the spark plugs by unscrewing them.
  2. Use a spark plug socket and ratchet to remove the old spark plugs.
  3. Inspect the old plugs for wear; clean or replace as necessary.
  4. Install new spark plugs, ensuring the correct gap is set (typically 0.030 inches for many Ford engines).
  5. Torque the new plugs to manufacturer specifications (usually around 13-15 ft-lbs).

3. Replace Ignition Coils

• Sub-steps:
  1. Remove the ignition coils that were previously unscrewed.
  2. Install new ignition coils, ensuring they sit flat and secure.
  3. Reconnect the wiring harness to each coil.

4. Clean or Replace Fuel Injectors

• Sub-steps:
  1. Remove the fuel rail assembly to access the injectors.
  2. If cleaning, use a fuel injector cleaning kit and follow the manufacturer's instructions.
  3. If replacing, install new injectors and ensure they are seated properly in the rail.
  4. Reattach the fuel rail and check for leaks.

5. Verify Fuel Pressure

• Sub-steps:
  1. Connect a fuel pressure gauge to the fuel rail.
  2. Turn the ignition on (without starting) to check for adequate pressure (typically 30-60 psi).
  3. If pressure is low, investigate the fuel pump and filter for issues.