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EGR Vacuum Modulator: Turbo
- Disconnect vacuum hoses from EGR vacuum modulator. Plug one end of vacuum hose connection on EGR vacuum modulator.
- Apply air pressure through remaining port. Air should pass freely through air filter side of EGR vacuum modulator.
- Start and operate engine at specified RPM. See EGR VACUUM MODULATOR TESTING SPECIFICATIONS table. Repeat test procedures in steps 1) and 2). Strong resistance of airflow should be felt. Replace EGR vacuum modulator if resistance is not felt. Reconnect vacuum hoses to proper locations.