why does my Toyota RAV4 XA50 (2019-2024) engine misfire when accelerating

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a flat surface and engage the parking brake.
• Disconnect the negative battery terminal to prevent electrical shock.

2. Replace Spark Plugs

• Tools Required: Socket set, torque wrench, spark plug socket.
• Remove the ignition coils by unscrewing the bolts and gently pulling them out.
• Unscrew the old spark plugs using the spark plug socket.
• Inspect the old spark plugs for wear; replace with new ones that match OEM specifications (e.g., NGK or Denso).
• Install new spark plugs and torque to the manufacturer’s specified value (usually around 13-15 lb-ft).
• Reinstall ignition coils, ensuring they seat properly.

3. Check and Replace Ignition Coils (if necessary)

• Tools Required: Socket set, torque wrench.
• If diagnostic steps indicated faulty ignition coils, remove them as described in the previous step.
• Install new ignition coils and torque to the manufacturer's specifications.
• Reconnect electrical connectors.

4. Clean or Replace Fuel Injectors

• Tools Required: Fuel injector cleaning kit or replacement injectors.
• If fuel injectors are clogged, either clean using a professional kit or replace them with new ones according to OEM specifications.
• Reinstall injectors and reconnect fuel lines securely.

5. Inspect and Repair Vacuum Leaks

• Tools Required: Vacuum gauge, hose clamps.
• Perform a visual inspection of vacuum hoses for cracks or disconnections.
• Replace any damaged hoses and ensure all connections are tight.