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EGR Vacuum Modulator

WARNING: This page is about a different car, the 1994 Toyota 4Runner. However, it is still accessible from the selected car via links, so may be relevant.
  1. Mark locations and disconnect vacuum hoses from EGR vacuum modulator. Block ports "P" and "R" of EGR vacuum modulator. See Figure.
    NOTE: Ports "P" and "R" are the double ports on side of EGR vacuum modulator. Port "Q" is the single port on side of EGR vacuum modulator.
  2. Apply air pressure to port "Q". See Figure. Air should pass freely through air filter side of EGR vacuum modulator.
  3. Start and operate engine at specified RPM. Refer to the 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.
EGR VACUUM MODULATOR TESTING SPECIFICATIONS

Application Engine RPM
4Runner 3500
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