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I have the repair manual in front of me (Haynes), and it says that the Lumina has the PCV valve in the valve cover. Hope this helps? On the 1992 Sable with either the 3.0L or 3.8L it is on the back valve cover (closest to the passenger compartment). It is harder to get to the PCV on the 3.8L engine. The actual PCV is connected to a rubber grommet on the engine valve cover and the other side PCV there is a hose that leads to another part of the engine.
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