Intake Manifold Vacuum Inspection: Notes
- 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 ).
- If not as specified, inspect following: