Vacuum Amplifier: Testing and Inspection

1. Disconnect hose that connects vacuum amplifier to EGR control valve and install ``T'' connector and vacuum gauge.
2. With engine idling vacuum gauge should read 5.31-6.5 inches Hg. If reading is excessively outside range, replace amplifier.
3. With engine speed at approximately 2000 RPM, vacuum gauge should read 11.18-12.76 inches Hg. If reading is outside range, replace amplifier.