EGR Vacuum Modulator
- EGR vacuum modulator is a 3-port type depending on application.
- 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.
- Operate engine at specified RPM. See EGR VACUUM MODULATOR 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 SPECIFICATIONS
| Application | Engine RPM |
|---|---|
| 3-Port Type | 3500 |