my Skoda Octavia NFL (2020-Present) stalls at stoplights, what's causing it?

Solution

1. Preparation

• Tools Required: OBD-II scanner, fuel pressure gauge, socket set, multimeter, cleaning supplies.
• Ensure the vehicle is parked on a level surface and the engine is cool.
• Disconnect the battery to prevent electrical shorts during the service.

2. Clean the Throttle Body

• Remove the air intake duct to access the throttle body.
• Spray throttle body cleaner onto a clean cloth and wipe the throttle body inside thoroughly.
• Ensure that the throttle plate operates smoothly and is free of carbon deposits.
• Reinstall the air intake duct and reconnect any sensors.

3. Inspect and Clean the Mass Airflow Sensor

• Locate the MAF sensor in the air intake path.
• Carefully remove the MAF sensor from its housing.
• Use MAF cleaner to spray the sensor elements and allow it to dry completely before reinstalling.
• Reconnect the MAF sensor ensuring a secure fit.

4. Test and Adjust Fuel Pressure

• Connect a fuel pressure gauge to the fuel rail's service port.
• Start the engine and observe the pressure reading; it should match the manufacturer's specifications (check service manual for exact values).
• If the pressure is low, inspect the fuel pump and filter for blockages or failures.

5. Inspect and Clean the Idle Air Control Valve

• Locate the IAC valve (usually mounted on or near the throttle body).
• Remove the IAC valve and inspect it for carbon buildup.
• Clean the valve with throttle body cleaner and reinstall it properly.

6. Check Spark Plugs and Ignition Coils

• Remove the spark plugs using a socket set.
• Inspect the spark plugs for wear and carbon buildup; replace if necessary.
• Test the ignition coils with a multimeter to ensure proper resistance; replace any faulty coils.