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EGR Vacuum Modulator

  1. EGR vacuum modulator is a 3-port type. Disconnect all hoses. Block ports "P" and "R". Apply air pressure to port "Q". See Fig 1. Air should pass through the air filter side of modulator freely.
  2. Operate engine at specified 2500 RPM on 2.0L or 3500 RPM on 2.5L. Repeat test procedures in step  1. Strong resistance of airflow should be felt. Replace EGR vacuum modulator if resistance is not felt. Reconnect vacuum hoses to proper locations.
Fig 1: Testing 3-Port Vacuum Modulator
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