Vacuum Amplifier: Testing and Inspection

Conditions

^ Normally warm engine.

^ Proper Curb Idle.

^ Adequate Manifold Vacuum.



Test

^ Connect a vacuum gauge to the hose at the EGR Port O. The gauge may read as much as 6.8 kPa(2 in-Hg) at idle.

^ Disconnect the venturi hose at the carburetor, and increase engine speed to 2000 rpm. Vacuum should not change.

^ Maintain high engine speed, and connect venturi hose. Gauge should register at least 13.5 kPa (4 in-Hg).

^ Return to idle. Gauge should return to initial reading.

^ If the above conditions are not met, replace the VVA.