why does my Ford Explorer Sixth Generation (2020-present) engine misfire when idling

Solution

1. Preparation

• Tools Required: OBD-II scanner, socket set, multimeter, fuel injector tester, vacuum gauge, basic hand tools.
• Safety Warnings: Disconnect the battery before working on electrical components. Ensure the engine is cool before starting work.

2. Replace Spark Plugs

• Remove the engine cover if applicable:
  1. Use a socket to remove the bolts securing the engine cover.
  2. Carefully lift off the cover.
• Remove old spark plugs:
  1. Disconnect the ignition coil connector.
  2. Remove the ignition coil by unscrewing its mounting bolts.
  3. Use a spark plug socket to remove the spark plugs from the cylinder head.
• Install new spark plugs:
  1. Apply anti-seize lubricant to the threads of the new spark plugs.
  2. Install the new spark plugs by hand to avoid cross-threading, then torque to the manufacturer’s specification (typically around 13-15 lb-ft).
  3. Reinstall the ignition coils and reconnect the connectors.
• Reattach the engine cover.

3. Replace Faulty Ignition Coils

• Identify the faulty coil based on diagnostic results:
  1. Remove the bolts securing the ignition coil to the engine.
  2. Disconnect the electrical connector from the coil.
• Install the new ignition coil:
  1. Position the new coil in place and secure it with bolts.
  2. Reconnect the electrical connector to the ignition coil.

4. Inspect and Clean Fuel Injectors

• Remove fuel injector rail:
  1. Relieve fuel pressure by removing the fuel pump fuse and running the engine until it stalls.
  2. Disconnect the fuel lines and remove the bolts securing the injector rail.
• Clean or replace fuel injectors:
  1. If cleaning, use a fuel injector cleaning kit and follow the manufacturer's instructions.
  2. If replacing, install new fuel injectors into the rail and reattach the fuel rail.

5. Check for Vacuum Leaks

• Inspect hoses and the intake manifold:
  1. Use a vacuum gauge to check for leaks.
  2. Spray carburetor cleaner around the intake manifold and vacuum hoses while the engine is running to detect changes in idle.
• Replace any damaged hoses or intake gaskets as necessary.