why does my Toyota RAV4 XA50 (2019-2024) have a rough idle when I start it

Solution

1. Preparation

• Gather tools and parts needed.
• Ensure the vehicle is parked on a level surface with the engine off.
• Disconnect the negative battery terminal for safety.

2. Check Spark Plugs and Ignition Coils

• Remove the engine cover (if applicable) using a socket set.
• Disconnect the ignition coil connectors and remove the ignition coils.
• Inspect each spark plug for wear; replace if the electrode is worn or fouled.
• Reinstall new or cleaned ignition coils securely and reconnect the connectors.

3. Clean Throttle Body

• Locate the throttle body and remove the intake duct connected to it.
• Use throttle body cleaner and a soft brush to clean any carbon buildup inside the throttle body.
• Ensure the throttle plate operates smoothly; check for any binding.
• Reinstall the intake duct, ensuring all clamps are secure.

4. Inspect Fuel System

• Use a fuel pressure gauge to check the fuel pressure at the fuel rail.
• If pressure is low, check the fuel pump and filter for blockages or failures.
• Clean or replace fuel injectors as necessary.

5. Reconnect Battery and Test

• Reconnect the negative battery terminal securely.
• Start the engine and monitor for rough idle; allow the engine to warm up.