INTAKE MANIFOLD VACUUM INSPECTION [ZY, Z6]
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1. Remove the fresh-air duct and the air cleaner case as a single unit. (See INTAKE-AIR SYSTEM REMOVAL/INSTALLATION [ZY, Z6].)
2. Disconnect the vacuum hose connecting the intake manifold and the purge solenoid valve (purge solenoid valve side) and install the vacuum gauge.
3. Install the fresh-air duct and the air cleaner case as a single unit. (See INTAKE-AIR SYSTEM REMOVAL/INSTALLATION [ZY, Z6].)
4. Verify that the intake air hoses are installed securely.
5. Warm up the engine.
6. Measure the intake manifold vacuum while idling (no load) using the vacuum gauge.