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Where is PCV valve 96 cadillac devile?

The PCV valve on a 1996 Cadillac DeVille is located on the top of the intake manifold. It's usually a small, round valve with a hose connected to it. However, the exact location on the intake manifold can vary slightly depending on the engine (4.6L Northstar or 4.9L). You'll likely need to consult a repair manual or a diagram specific to your engine for precise placement. A visual inspection of the top of the intake manifold with the engine cover removed will likely help you locate it.