Car Problem Reports

Mercury Mountaineer Vacuum leak from intake manifold O-ring gaskets

Mercury Mountaineer Problem
19 Reports
Me Too

Model Years Affected: 1998, 1999, 2000, 2001, 2002, 2003, 2005, 2006

Engines Affected: 4.0L V6, 4.0L V6 SOHC, 4.6L V8, 5.0L V8

Average Mileage: 156,172 mi (101,124 mi - 235,000 mi)


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

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