why does my Volkswagen Golf MK7 (2015-2019) stall when I stop at traffic lights?

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Disconnect the battery to prevent electrical shorts.

2. Clean or Replace the Air Filter

• Sub-steps:
  • Remove the air filter housing cover using a socket set.
  • Take out the air filter and inspect for dirt or damage.
  • Clean the housing with a vacuum or replace the filter if necessary.

3. Throttle Body Cleaning

• Sub-steps:
  • Locate the throttle body; remove the intake duct connected to it.
  • Use throttle body cleaner and a soft brush to clean the throttle plate and bore.
  • Reassemble the intake duct securely.

4. Fuel Pressure Check

• Sub-steps:
  • Connect a fuel pressure gauge to the fuel rail test port.
  • Turn the ignition to the "ON" position without starting the engine and check pressure.
  • Compare the reading to manufacturer specifications (typically around 55-60 psi).
  • If pressure is low, consider replacing the fuel pump or filter.

5. Idle Air Control Valve Inspection

• Sub-steps:
  • Locate the IACV on the throttle body.
  • Disconnect the electrical connector and remove the IACV with a socket set.
  • Clean the valve with an appropriate cleaner and inspect for wear. Replace if necessary.

6. Check Vacuum Lines

• Sub-steps:
  • Visually inspect all vacuum hoses connected to the intake manifold for cracks or disconnections.
  • Replace any damaged hoses and ensure all connections are secure.