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Home >> Mercury >> 1977 >> Capri II Base, 2.3L Eng, Automatic Trans >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Exhaust Gas RECIRCULATION (EGR) System (CAPRI II) >> Testing >> VENTURI Vacuum Amplifier >> Single Vacuum Plug Design

Single Vacuum Plug Design

  1. Remove output hose from amplifier (EGR valve-to-vacuum amplifier hose) and connect hose to a vacuum gauge. See Figure. Remove reservoir vacuum hose and "T" it with the source vacuum line.
  2. Momentarily increase engine speed to 1500-2000 RPM. With engine at idle, remove vacuum hose at carburetor venturi. Vacuum gauge reading should be within 0.3 in. Hg of bias value. If not, replace vacuum amplifier.
  3. Depress accelerator pedal and release after engine speed has reached 1500-2000 RPM. If vacuum gauge shows an increase of 1 in. Hg or more during acceleration, replace vacuum amplifier.
  4. Connect venturi hose to carburetor. If vacuum gauge reading increases more than 0.5 in. Hg check idle speed and correct if necessary. Rapidly increase engine speed to 1500-2000 RPM and note vacuum gauge reading. Vacuum should increase to above 4 in. Hg during acceleration and return to specified bias at idle. If not, replace vacuum amplifier.
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