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Home >> Ford >> 1994 >> Explorer 2D Utility, 4WD, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System/Component Tests >> Emission Systems & Sub-Systems >> Secondary Air Injection >> Vacuum Check Valve

Vacuum Check Valve

Apply 16 in. Hg vacuum to check side of valve and trap. If vacuum remains greater than 15 in. Hg for 10 seconds, valve is okay. If vacuum drops faster, replace valve.

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