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Home >> Subaru >> 2021 >> WRX STI >> Repair and Diagnosis >> Engine Mechanical >> Blowers, Superchargers & Turbochargers >> Engine Intake System (Induction) And Turbocharger (2.5L) >> Air By-pass Valve >> Inspection >> Air By-Pass Valve

Air By-Pass Valve

  1. Check that the air by-pass valve has no deformation, cracks or other damages.
  2. Connect the Mighty Vac to the nipple (A) of the air by-pass valve.
    G08539118Courtesy of SUBARU OF AMERICA, INC.
  3. Using the Mighty Vac, generate the vacuum pressure to -93.3 kPa (-0.95 kg/cm2 , -13.5 psi). Check that the Mighty Vac gauge needle indication holds 10 seconds without dropping down to lower than -92.6 kPa (-0.94 kg/cm2 , -13.4 psi).
  4. Set a dial gauge to the end of valve rod of the air by-pass valve.
    G08539119Courtesy of SUBARU OF AMERICA, INC.
  5. Slowly generate vacuum pressure with the Mighty Vac and check the pressure when the needle of the dial gauge (valve stroke) becomes 0.5 mm (0.02 in). If it is not within the standard, replace the air by-pass valve.

    Opening pressure (valve stroke 0.5 mm (0.02 in)): 

    Standard 

    -62.7 --70.7 kPa (-0.64 --0.72 kg/cm2 , -9.09 --10.3 psi)

  6. Increase vacuum pressure more than 5) and check the pressure when the needle of the dial gauge (valve stroke) becomes 7.5 mm (0.3 in). If it is not within the standard, replace the air by-pass valve.

    Full open pressure (valve stroke 7.5 mm (0.3 in)): 

    Standard 

    -102.7 --117.3 kPa (-1.05 --1.20 kg/cm2 , -14.9 --17.0 psi)

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