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Home >> Chevrolet >> 1987 >> Spectrum Express >> Repair and Diagnosis >> Engine Performance >> System >> Air Injection System >> Component Testing >> Vacuum Switching Valve (VSV)
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Vacuum Switching Valve (VSV)

  1. Apply battery voltage to VSV. Air should flow freely through ports A and B of valve.
  2. Remove voltage from VSV. Air should not flow through ports A and B of valve. Replace VSV if not performing as specified.
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