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Vacuum Amplifier

  1. Check for adequate manifold vacuum. With engine warm and at curb idle. Connect vacuum gauge to port on amplifier which leads to EGR/PVS valve. Vacuum should not read more than 2 in. Hg at idle.
  2. Disconnect venturi hose at carburetor. Increase engine speed to 3000 RPM on 2.3L engines, and 2000 RPM on all other engines. Vacuum should not change. Maintain high engine speed and reconnect venturi hose.
  3. Gauge should register at least 4 in. Hg vacuum. Return engine to idle. Gauge should return to initial reading. If not, replace amplifier.
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