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Screwed into the top of the head. each plug has its own little coil on top of it. Remove the long black plastic cover to get access to them all.

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14y ago
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15y ago

The maintenance schedule in your owners manual will tell you every 30,000 miles. Realistically every 60,000 miles is fine.

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Q: When should spark plugs be changed on a 2006 Grand Cherokee 4.7L?
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