how to fix a misfire in my Toyota Highlander XU70 (2020-Present)

Solution

1. Preparation

• Gather necessary tools and parts.
• Park the vehicle on a flat surface and engage the parking brake.
• Disconnect the battery to prevent accidental shocks.

2. Inspect and Replace Spark Plugs

• Sub-steps:
  1. Remove the engine cover (if applicable) using a socket set.
  2. Disconnect the ignition coil connectors.
  3. Remove the ignition coils using a socket wrench.
  4. Extract the spark plugs using a spark plug socket.
  5. Inspect the spark plugs for wear; replace if necessary (typically every 60,000 miles).
  6. Install new spark plugs, tightening to the manufacturer's specified torque (usually around 13 lb-ft).
  7. Reinstall ignition coils and connectors.

3. Inspect and Replace Ignition Coils

• Sub-steps:
  1. If any ignition coil was found faulty, replace it with a new one.
  2. Ensure the new ignition coil is seated properly on the spark plug.
  3. Reconnect the electrical connectors and ensure they click into place.

4. Check and Clean Fuel Injectors

• Sub-steps:
  1. If fuel injectors are suspected to be faulty, remove the fuel rail (ensure the fuel system is depressurized).
  2. Inspect the injectors for clogs or leaks.
  3. Clean the injectors using a fuel injector cleaning kit or replace them if necessary.
  4. Reassemble the fuel rail and reconnect any disconnected lines.

5. Inspect Air Intake System

• Sub-steps:
  1. Check the air filter and replace if dirty.
  2. Inspect the intake manifold and hoses for any leaks or cracks.
  3. Replace any damaged components as required.