how to fix a misfire in my Toyota RAV4 Fifth Generation (2019-present)

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to ensure safety during repairs.
• Allow the engine to cool before starting work.

2. Replace Spark Plugs

• Tools Required: Socket set, torque wrench, spark plug socket, dielectric grease.
• Remove the ignition coils by unscrewing them and pulling them out.
• Using the spark plug socket, remove the old spark plugs.
• Inspect the new spark plugs to ensure correct gap (usually 0.043 inches for RAV4).
• Apply a small amount of dielectric grease to the threads of the new spark plugs.
• Install new spark plugs, tightening them to the manufacturer’s torque specification (typically 13 lb-ft or 18 Nm).

3. Inspect and Replace Ignition Coils (if necessary)

• Tools Required: Socket set.
• If the ignition coils are faulty, remove the old coils and replace them with new ones.
• Ensure that each coil clicks securely into place when installed.

4. Check Fuel Injectors

• Tools Required: Fuel pressure gauge.
• Connect the fuel pressure gauge to the fuel rail.
• Turn the ignition on (without starting the engine) to check for proper fuel pressure (should be around 50-60 psi).
• If pressure is low, inspect the fuel pump and fuel filter for issues, replacing them as necessary.

5. Inspect for Vacuum Leaks

• Tools Required: Smoke machine (optional).
• Visually inspect all vacuum hoses and connections for cracks or disconnections.
• Use a smoke machine or spray soapy water around intake areas to identify leaks.
• Replace any damaged hoses or seals.