why does my Toyota RAV4 XA50 (2019-2024) engine misfire when accelerating

Solution

1. Preparation

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

2. Replace Spark Plugs

• Sub-steps:
  1. Remove the engine cover if applicable.
  2. Disconnect the ignition coil connectors.
  3. Remove the ignition coils using a socket set (typically 10mm).
  4. Unscrew and remove the old spark plugs using a spark plug socket.
  5. Install new spark plugs, ensuring the gap is set to the manufacturer's specification (usually around 0.043 inches).
  6. Reinstall the ignition coils and reconnect all connectors.

3. Test and Replace Ignition Coils (if necessary)

• Sub-steps:
  1. Use a multimeter to test the ignition coils’ resistance.
  2. Replace any faulty ignition coils with new ones.
  3. Follow the same reinstallation steps as for the spark plugs.

4. Clean or Replace Fuel Injectors

• Sub-steps:
  1. Remove the fuel rail assembly to access the fuel injectors.
  2. Inspect and clean injectors using a fuel system cleaner or replace them if necessary.
  3. Reinstall the fuel rail and ensure all seals are properly seated.

5. Verify Fuel Pressure

• Sub-steps:
  1. Connect a fuel pressure gauge to the fuel rail test port.
  2. Turn the ignition to the "ON" position (without starting) and check the pressure reading.
  3. If the pressure is below specifications, consider replacing the fuel pump or fuel filter.