how to fix engine misfires in my Toyota Camry Eighth Generation (2018-present)

Solution

1. Preparation

• Gather tools and parts.
• Disconnect the negative battery terminal to prevent electrical shorts.
• Allow the engine to cool before beginning any work.

2. Replace Spark Plugs

• Tools Required: Spark plug socket, ratchet, torque wrench, dielectric grease.
• Remove the ignition coils by unscrewing the bolts and gently pulling them out.
• Use a spark plug socket to remove the old spark plugs.
• Inspect the old plugs for signs of wear; replace if necessary.
• Apply a small amount of dielectric grease to the threads of the new spark plugs and install them to the manufacturer's torque specifications (typically 12-16 ft-lbs).
• Reinstall the ignition coils.

3. Test and Replace Ignition Coils (if necessary)

• Tools Required: Multimeter.
• Test each ignition coil's primary and secondary resistance according to the specifications in the service manual.
• If any coil is out of specification, replace it with a new one.
• Reconnect the ignition coils after ensuring they are functioning correctly.

4. Check Fuel System

• Tools Required: Fuel pressure gauge.
• Connect the fuel pressure gauge to the fuel rail.
• Turn the ignition to the "ON" position (do not start the engine) and check the fuel pressure.
• If the pressure is below specifications, check the fuel pump and filter for clogs or failures and replace as necessary.

5. Inspect for Vacuum Leaks

• Use a smoke machine or carburetor cleaner to check for vacuum leaks around the intake manifold and hoses.
• Replace any damaged hoses or gaskets found during inspection.