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Where are the spark plugs located on a 1993 cadillac deville 49?

The spark plugs on a 1993 Cadillac DeVille 4.9L (the 49 refers to the engine displacement) are located on top of the engine, under the valve covers. You'll need to remove the valve covers to access them. It's a somewhat involved process requiring tools and some mechanical aptitude. A repair manual specific to your 1993 Cadillac DeVille 4.9L is highly recommended as it will provide detailed diagrams and instructions, including the precise location of each spark plug and the proper torque specifications.