my Toyota Corolla E210 (2019-2024) keeps misfiring, how do I fix it?

Solution

1. Preparation

• Tools Required: OBD-II scanner, socket set, torque wrench, multimeter, compression tester.
• Safety Warnings: Disconnect the battery before starting work on electrical components.

2. Replace Spark Plugs

1. Remove the engine cover (if applicable) using the socket set.
2. Disconnect the ignition coil connectors and remove the ignition coils using the socket set.
3. Unscrew the old spark plugs using the spark plug socket and ratchet.
4. Inspect the old spark plugs for wear and ensure the gap is set to the manufacturer's specifications.
5. Install new spark plugs, ensuring the correct torque (typically 13-15 ft-lbs).
6. Reinstall ignition coils and reconnect the connectors.

3. Replace Ignition Coils (if necessary)

1. If misfire codes indicate faulty ignition coils, remove the coils as previously instructed.
2. Install new ignition coils, ensuring they are seated properly.
3. Reconnect the ignition coil connectors.

4. Check and Replace Fuel Filter (if needed)

1. Locate the fuel filter, typically near the fuel tank or along the fuel line.
2. Relieve fuel system pressure by removing the fuel pump fuse and running the engine until it stalls.
3. Disconnect the fuel lines using the appropriate tools and remove the old fuel filter.
4. Install the new fuel filter, ensuring proper orientation and connection of fuel lines.

5. Inspect and Clean Air Intake System

1. Remove the air intake duct and inspect for blockages or leaks.
2. Clean the throttle body using throttle body cleaner and a soft cloth.
3. Reassemble the air intake components securely.