Intake Manifold Vacuum Inspection

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.