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Home >> Ford >> 1996 >> Aerostar Van Window >> Repair and Diagnosis >> External Pages >> Different car >> Section 158 (Engine Controls - System/Component Tests - EEC-IV (4.0L)) >> Emission Systems & Subsystems >> Secondary Air Injection >> Vacuum Check Valve

Vacuum Check Valve

WARNING: This page is about a different car, the 1995 Ford Explorer and 1995 Ford Aerostar. However, it is still accessible from the selected car via links, so may be relevant.

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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