Intake Manifold Vacuum Inspection

WARNING: This page is about a different car, the 2005 Mazda 6. However, it is still accessible from the selected car via links, so may be relevant.

Verify air intake hoses are installed properly.
Start the engine and run it at idle.
Measure the manifold vacuum using a vacuum gauge.
- If not as specified, inspect following:
  - Air suction at throttle body, intake manifold and PCV valve installation points
  - EGR valve (struck open)
  - Fuel injector insulator
  - Engine compression (See COMPRESSION INSPECTION .)
    Specification
    
    More than 60 kPa {450 mmHg, 18 inHg}
    NOTE:
    Air suction can be located by engine speed change when lubricant is sprayed on the area where suction occurs.