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Home >> Geo >> 1991 >> Prizm Base, 4D Hatchback, Standard >> Repair and Diagnosis (Single Page) >> Engine Performance >> Testing & Diagnosis >> Engine Controls - System/Component Tests >> Emission Systems & Sub-Systems >> Fuel Evaporation >> Fuel Evaporation Bimetallic Vacuum Switching Valve (BVSV)

Fuel Evaporation Bimetallic Vacuum Switching Valve (BVSV)

  1. Remove vacuum hoses from BVSV, located on intake manifold. With engine temperature less than 95°F (35°C), blow into BVSV. No air should pass through valve.
  2. With engine temperature greater than 122°F (50°C), blow into BVSV. Air should pass through BVSV. Replace BVSV if defective.
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