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Home >> Mercury >> 1976 >> Capri II Base, 2.3L Eng, Automatic Trans >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Cold Temp. Activated Vacuum System >> Testing >> Vacuum Test
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Vacuum Test

  1. Connect a tachometer to engine. Connect a vacuum gauge to hose at point "A". Ensure that temperature sensing switch is over 65°F (18°C). Disconnect lead at point "B". See Figure.
  2. Run engine at 1500 RPM, vacuum should be approximately 15 in. Hg. If there is no vacuum, check vacuum source back to carburetor spark port.
  3. Connect lead at point "B". There should be no or low vacuum. If there is vacuum, check vacuum valve ground and electrical source back to ignition switch.
  4. Run engine to 3000 RPM, vacuum should be approximately 9 in. Hg. If there is no vacuum, check vacuum source back to carburetor EGR port.
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