why does my Toyota RAV4 XA40 (2013-2018) engine misfire when I accelerate

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a level surface and the engine is cool.
• Disconnect the negative battery terminal to avoid electrical shock.

2. Inspect and Replace Spark Plugs

• Remove engine cover if necessary.
• Use a socket set to remove the spark plugs.
• Inspect each spark plug for signs of wear, carbon buildup, or damage.
• If damaged, replace with OEM specifications (e.g., NGK or Denso) with the correct gap (typically 0.043 inches).
• Reinstall spark plugs and torque to manufacturer specifications (typically 13 ft-lbs).

3. Check and Replace Ignition Coils

• Remove the ignition coil assembly by disconnecting the electrical connector and unbolting the coil.
• Inspect for cracks or signs of wear.
• Test the coils with a multimeter; replace any that are out of specification.
• Install new ignition coils, ensuring they are properly seated and connected.

4. Clean or Replace Fuel Injectors

• Remove the fuel rail to access the fuel injectors.
• Use an injector cleaning solution or service to clean if clogged.
• Replace any damaged injectors with OEM replacements.
• Reinstall the fuel rail with new O-rings to prevent leaks.

5. Test and Adjust Fuel Pressure

• Connect a fuel pressure gauge to the fuel rail.
• Turn the ignition on (without starting the engine) and check pressure against manufacturer specifications (typically around 50-60 psi).
• If low, inspect the fuel pump and filter for issues; replace if necessary.

6. Inspect the Air Intake System

• Check the air filter for clogs and replace if necessary.
• Inspect the intake manifold for vacuum leaks.
• Replace any damaged hoses or fittings.