Problem Reports
Mercury Mountaineer
Report: Vacuum leak from intake manifold O-ring gaskets
Mercury Mountaineer Problem
Model Years Affected: 1998, 1999, 2000, 2001, 2002, 2003
Engines Affected: 4.0L V6, 4.0L V6 SOHC, 4.6L V8, 5.0L V8
Average Mileage: 141,160 mi (101,124 mi - 220,000 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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Visitor, 2002 Mercury Mountaineer, 4.6L V8, 142,000 mi
engine dies and will not idellat a stop check engine light is on
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Visitor, 2003 Mercury Mountaineer, 4.6L V8, 125,000 mi
mechanic changed intake gasket
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yogi65, 1998 Mercury Mountaineer, 5.0L V8, 140,000 miRookie
did a tune up fuel filter an it is still running rough an the RPM are hunting any ideas
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Visitor, 1998 Mercury Mountaineer, 5.0L V8, 220,000 mi
Rough Idle and throwing engine codes p0300 random engine misfire. Before replacing gaskets I bought 2 new coil packs and new wires and plugs (performance) spent about $275 and still had problems like no other. Buying gaskets now and putting them on and its fixed
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