Vacuum Amplifier: Testing and Inspection

1. Connect a vacuum gauge between the vacuum amplifier and the red hose from the throttle port.
2. With the engine at normal operating temperature and at idle, vacuum should be 7 - 20 mbar (.79 - 1.3 in. Hg).
3. Re-connect the hose to the vacuum amplifier and connect the vacuum gauge between the EGR valve and the yellow hose from the vacuum amplifier.
4. With the engine at idle, gauge must read 67 - 160 mbar (1.6 -4.5 in. Hg).
5. If vacuum readings are not within specification:
a. Verify that manifold (source) vacuum is available.
b. Verify that all vacuum hoses are in good condition with no leaks.
c. If source vacuum and hoses are OK, replace the vacuum amplifier.