how to check for vacuum leaks in my Volkswagen Golf MK7 (2015-2019)

Solution

1. Preparation

• Gather tools and materials: vacuum gauge, smoke machine, carburetor cleaner, safety goggles, and gloves.
• Ensure the vehicle is parked on a flat surface and the engine is cool.
• Disconnect the battery to ensure safety while working on the engine.

2. Visual Inspection

• Inspect Vacuum Hoses:
  • Check all visible vacuum hoses for cracks or loose fittings.
  • Pay special attention to connections at the intake manifold and throttle body.
• Reconnect Loose Hoses:
  • If any hoses are disconnected, reattach them securely. Replace any that are damaged.

3. Conduct the Smoke Test

• Setup Smoke Machine:
  • Attach the smoke machine to the intake system.
• Run the Machine:
  • Activate the smoke machine and observe for smoke escaping from any areas, indicating leaks.
• Seal Leaks:
  • If leaks are found, repair or replace the affected hoses or gaskets.

4. Perform the Spray Test

• Start the Engine:
  • Allow the engine to reach operating temperature.
• Apply Carburetor Cleaner:
  • Spray a small amount of carburetor cleaner around the intake manifold, throttle body, and vacuum hose connections.
• Monitor RPM Changes:
  • If the engine RPM increases or fluctuates, a leak is present in that area.

5. Use a Vacuum Gauge

• Connect the Vacuum Gauge:
  • Attach the gauge to a manifold vacuum source.
• Check Readings:
  • Observe the gauge for steady readings between 17-21 inHg. If readings are lower, investigate further for leaks.
• Repair as Necessary:
  • Based on the readings, replace any faulty components.