how to fix the engine misfire in my Toyota Corolla E210 (2019-2024)?

Solution

1. Preparation

• Gather required tools and parts.
• Ensure the vehicle is parked on a level surface with the engine off.
• Disconnect the negative battery terminal to ensure safety.

2. Inspect and Replace Spark Plugs

1. Remove the engine cover, if applicable.
2. Use a socket and ratchet to remove the spark plug wires or ignition coils, depending on the configuration.
3. Use a spark plug socket to carefully remove each spark plug.
4. Inspect the spark plugs for wear or damage; replace them with OEM specifications (typically NGK or Denso).
5. Torque new spark plugs to the manufacturer's specifications (usually around 13-15 lb-ft).

3. Check and Replace Ignition Coils

1. If any spark plugs were damaged or if misfire codes indicate specific cylinders, inspect the corresponding ignition coils.
2. Disconnect the wiring harness from each ignition coil.
3. Remove the ignition coil using a socket and ratchet.
4. Install new ignition coils that meet OEM specifications and reconnect the wiring harness.
5. Ensure coils are seated properly and secure.

4. Inspect Fuel Injectors

1. Remove any necessary components to access the fuel injectors.
2. Check for proper electrical connection and any leaks.
3. If injectors are clogged, remove and clean them using an ultrasonic cleaner or replace them as needed.
4. Reinstall fuel injectors and ensure all connections are secure.

5. Perform Compression Test (if necessary)

1. Remove the spark plugs to facilitate the test.
2. Insert a compression tester into the spark plug hole of each cylinder.
3. Crank the engine for several seconds and note the pressure readings.
4. Compare readings to manufacturer specifications; if low, further diagnosis may be required.