how to troubleshoot engine misfires in Toyota Corolla E210 (2019-2024)

Solution

1. Preparation

• Tools Required: OBD-II scanner, socket set, torque wrench, multimeter, fuel pressure gauge, compression tester.
• Ensure the vehicle is parked on a flat surface and the engine is cool.
• Disconnect the negative battery terminal to prevent electrical shocks.

2. Inspect and Replace Spark Plugs

• Remove the engine cover if applicable.
• Use a socket set to remove each spark plug (torque specification: 13 lb-ft for installation).
• Inspect each spark plug for signs of wear or fouling. Replace with OEM specifications (typically Denso or NGK).
• Reinstall the new spark plugs, ensuring proper torque.

3. Check and Replace Ignition Coils

• Disconnect the electrical connectors from the ignition coils.
• Remove the ignition coils using a socket set.
• Test each ignition coil with a multimeter (primary resistance: 0.4-2 ohms; secondary resistance: 6,000-15,000 ohms).
• Replace any faulty ignition coils with OEM parts.

4. Inspect Fuel Injectors

• Perform a fuel pressure test to ensure adequate fuel delivery (specification: 43-50 psi).
• If pressure is low, check the fuel pump and filter.
• Remove and clean fuel injectors using a professional cleaning kit or replace if clogged.

5. Check Air Intake System

• Inspect the air filter and replace if dirty or clogged.
• Check for vacuum leaks in hoses and the intake manifold.
• Ensure the Mass Air Flow (MAF) sensor is clean; use MAF sensor cleaner if necessary.

6. Compression Test

• Remove spark plugs and insert the compression tester into each cylinder.
• Crank the engine and record the compression readings (specification: 180-200 psi).
• If readings are low, further investigation into internal engine components may be required.