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You have to take off the plastic intake cover there are a few screws holding it on. This will expose the front 4 plugs. To get at the rear 4 you will need to remove the spark plug coil packs, there are 4 bolds on this assembly I believe, then you can get at the back 4 plugs. Some of these may also need to be accessed from the bottom of the car, if you have big hands.

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Q: How do you change the spark plugs on a 2001 Cadillac Seville SLS?
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