Vacuum Amplifier: Testing and Inspection

1. Start engine and allow to reach normal operating temperature.

2. On 1976-78, disconnect vacuum amplifier vacuum hose from three-way solenoid valve and connect a vacuum gauge to hose.

3. On 1979-80 and 1981 except California, disconnect vacuum amplifier vacuum hose from water thermo valve and connect a vacuum gauge to hose.

4. On 1981 California, disconnect vacuum amplifier hose from EGR control valve and connect a vacuum gauge to hose.

5. Disconnect vacuum amplifier hose from carburetor.

6. Depress accelerator several times and allow engine to return to idle. The vacuum gauge should indicate 2 ± .04 inches Hg vacuum.

7. Reconnect vacuum amplifier hose to carburetor and increase engine speed to 3500 RPM. The vacuum gauge should now indicate 3.54 inches Hg vacuum. If not, replace vacuum amplifier.

8. Reconnect all vacuum hoses to original positions.