sheila l dickerson Posted on Aug 28, 2016

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How do i change the spark plugs. And how many do i need for a 2005 mercury mountaineer mariner

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Bill Boyd

Mercury Master 53,816 Answers
Posted on Aug 28, 2016

Bill Boyd

Mercury Master

Joined: Jan 04, 2013

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4 plugs for a 4 cylinder, 6 plugs for a 6 cylinder and 8 for an 8 cylinder --none for a diesel
pull the coil / lead of each plug ( one at a time ) unscrew the plug using the appropriate tool and replace
when you have to ask these questions it will be cheaper and quicker to get them changed professionally ( plugs cost from $8.00 each for the cheapest to $25.00 each for top quality lines )
AS efi plugs seldom need changing but you have a problem like a misfire, run the fault codes first and have the injectors checked

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