Intake Manifold Vacuum Inspection
- Disconnect the evaporative hose between the intake manifold and purge solenoid valve from the intake manifold side.
- Connect a vacuum gauge to the intake manifold.
- Verify the air intake hoses are installed properly.
- Start the engine and let it idle.
- Measure the intake manifold vacuum.
- If not within specification, inspect the following:
Specification
-60.0 kPa {-450 mm Hg, -17.7 in Hg}
NOTE:- Air suction can be located by the engine speed change when lubricant is sprayed on the area where suction is occurring. Check the following places:
- Air suction at throttle body, evaporative hose, vacuum hose, ventilation hose, check valve (built-into vacuum hose), fuel injector, intake manifold and PCV valve installation points
- Check valve (built-into vacuum hose) (See VACUUM LINE INSPECTION .)
- Engine compression (See COMPRESSION INSPECTION .)