Question about 2003 Mercury Mountaineer

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2003 merc. mountaineer with v-8, has a miss, service eng. light o

Has miss on one cyl, can clear out eng. light, will run fine for little bit, starts missing again,and light comes on

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Check to see if your overflow tube againt the fire wall on passenger side is not leaking onto cylinder 4. Pull spark plug boot and make sure it is dry. When the heater core starts going bad it will leak out over flow right there

Posted on Feb 04, 2009

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Sounds like the same thing mercury sable did. Put on computer and said that plug #5 wasn't firing. Put a ignition coil on the one not firing and it will fix it. The car before I fixed it would run ok but then would miss at a stop but once you got up to certain speed it would line out.

Posted on Aug 03, 2012

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Posted on Jan 02, 2017

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