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Home >> Ford >> 1992 >> Probe GL, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System/Component Tests - EEC-IV >> Emission Systems & Sub-Systems >> Air Injection >> Vacuum Check Valve
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Vacuum Check Valve

Apply 16 in. Hg vacuum to check valve. If vacuum remains greater than 15 in. Hg for 10 seconds, valve operation is normal. If vacuum drops faster, replace valve.

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