Where is the PVC valve on a 1988 Buick Century with 2.8 engine?

The Positive Crankcase Ventilation (PCV) valve on a 1988 Buick Century with a 2.8L engine is typically located on the valve cover. It's usually a small, round valve with a hose connected to it on each end. One hose goes to the intake manifold, and the other to the crankcase.

However, the exact location on the valve cover can vary slightly. It's best to consult a repair manual specific to your 1988 Buick Century 2.8L engine for a diagram showing its precise placement. A Haynes or Chilton manual would be a good source. You can also search online for "1988 Buick Century 2.8L engine diagram" to find images that might show its location.