Vacuum Leak From Intake Manifold O-Ring Gaskets on Ford Explorer Sport Trac

The intake manifold O-ring gaskets commonly leak, causing stalling and poor idle quality; the Check Engine Light will illuminate.

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Average mileage: 91,491 (58,000–165,000)
Engine affected: 4.0L V6
3 model years affected: 2001, 2002, 2007
7 people reported this problem
4 people shared problem details
check engine light on, lean mixture banks 1 an 2. Found leaking hose for the PCV system at top front of engine,near upper raditor hose connection. It is a 90 degree angled 1/2 inch hose 3 x3 inches long. Rubber deteriorated from age. Found 3 more at salvage yard with similar problem. This is on a 4.0 v6 engine, Ford Eplorer, Sport trac, and Ranger that use this motor.
Vacuum Leak From Intake Manifold O-Ring Gaskets
same as others, not repaired yet.
Same exact problem, was replaced by dealer for a good sum of money, around $400
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