Intake Manifold Vacuum Inspection [L5]

WARNING: This page is about a different car, the 2009 Mazda 6. However, it is still accessible from the selected car via links, so may be relevant.

Verify that the intake air hoses are installed securely.
Warm up the engine
Disconnect the vacuum hose connecting the intake manifold and the purge solenoid valve (purge solenoid valve side) and install the vacuum gauge. See PURGE SOLENOID VALVE REMOVAL/INSTALLATION [L5] .
Measure the intake manifold vacuum while idling (no load) using the vacuum gauge.
- If not within the specification, perform the following inspections.
  - Compression pressure. See COMPRESSION INSPECTION [L5] .
  - Air suction (installation areas of throttle body, fuel injector, PCV valve, intake manifold)
Standard

-73.5 kPa {-551 mm Hg, -21.7 in. Hg} or more