Mercury Mountaineer Problem Report

Mercury Mountaineer Vacuum leak from intake manifold O-ring gaskets

(19 reports)

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

engine dies and will not idellat a stop check engine light is on -
mechanic changed intake gasket -
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 -
Loud clanking noise when first started then when it warms up it stops -
Exhaust Mel inside cabin. Loss of power. Feels like it won't go into gear. -
did a tune up fuel filter an it is still running rough an the RPM are hunting any ideas -
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