- Start the engine and warm it to normal operating temperature.
- Disconnect the vacuum amplifier vacuum hose from the solenoid valve or thermo
valve. Connect a vacuum gauge to this hose.
- Disconnect the vacuum amplifier vacuum hose from the carburetor. The vacuum
hose to the intake manifold should remain connected.
- Depress and release the accelerator several times, then allow the engine
to idle. The vacuum gauge reading should be 2.0.04 in.Hg.
- Reconnect the vacuum amplifier vacuum hose to the carburetor.
- Increase engine speed to 3,500 rpm. The vacuum gauge reading should be 3.54
in.Hg. If the vacuum amplifier does not test properly, replace it.
- After all tests are completed, return the hoses to their original positions.
