how to check for vacuum leaks in Toyota Highlander XU70 (2020-Present)

Solution

1. Preparation

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

2. Inspect Vacuum Hoses

• Use a flashlight to inspect all visible vacuum hoses.
• Look for cracks, loose connections, or signs of deterioration.
• If any damaged hoses are found, make a note of their locations for replacement.

3. Smoke Test

• Connect a smoke machine to the intake manifold or vacuum source.
• Fill the system with smoke and observe any smoke escaping from hose connections or the intake manifold.
• Identify and mark areas where smoke is escaping, indicating a leak.

4. Replace Damaged Hoses

• If any hoses are identified as damaged, remove them using a socket set (if necessary).
• Install new hoses, ensuring a secure fit and proper routing.
• Use hose clamps where applicable to secure the connections.

5. Reassemble and Connect Battery

• Reconnect any components removed during inspection (e.g., engine covers, air intake components).
• Reconnect the battery and ensure all electrical connections are secure.