Can anyone help me on how to change my spark plugs. I usually do it my self but this time I notice that they have like a sensor on top of spark plug. It is for a 2001 Grand Marquis[img]smileys/smiley3.gif[/img]

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That is a coil on each plug. I'm not sure if you have to undo the electrical plug, but therewill bea screw holding the coil. You have to remove it to access the spark plug. I'm basing this on 98-2000 models and yours is probably the same.