why does my Toyota RAV4 XA50 (2019-2024) engine misfire during acceleration

Solution

1. Preparation

• Ensure the vehicle is parked on a level surface and the engine is cool.
• Disconnect the battery to prevent electrical shocks.
• Gather all necessary tools and parts.

2. Replace Spark Plugs

• Remove the engine cover if applicable.
• Use a socket set to remove the spark plug wires or ignition coils.
• Remove the old spark plugs using a spark plug socket and replace them with new ones, ensuring they are gapped correctly (typically 0.043 inches for most RAV4 models).
• Reattach the ignition coils or spark plug wires securely.

3. Inspect and Replace Ignition Coils

• Use a multimeter to check the resistance of each ignition coil; replace any that are outside manufacturer specifications.
• Remove any faulty ignition coils and replace them with new ones, ensuring they are properly seated.

4. Clean or Replace Fuel Injectors

• If injectors are clogged, use a fuel injector cleaning kit to clean them or replace them if cleaning is ineffective.
• Ensure the fuel rail pressure is released before removing injectors.
• Reinstall fuel injectors and ensure all connections are secured.

5. Inspect Air Intake System

• Check the air filter for cleanliness and replace if dirty.
• Inspect the intake manifold and vacuum hoses for leaks; replace any damaged hoses.
• Clean the throttle body if necessary.

Tools Required:

• OBD-II scanner
• Socket set
• Multimeter
• Fuel pressure gauge
• Spark plug socket
• Screwdrivers

Parts Required:

• Spark plugs
• Ignition coils
• Fuel injectors (if necessary)
• Air filter

Estimated Repair Time: 3-5 hours

Safety Warnings:

• Disconnect battery before working on electrical systems.
• Allow engine to cool before opening any components.