It's going to be off the valve cover(s) one or the other. Plugged right into it.
PCV Valve is located near front of hood on the engine block between the fuel injectors.
Remove the vacuum hose from your 1989 Oldsmobile 3.8 liter engine PCV valve. Remove the retaining bolts from the valve. Reverse the process to install the new PCV valve.
The PCV valve is located in the rocker cover (valve cover) Once you locate it pull up on the hose that is connected to it. Remove the PCV valve and put new one in. Reinstall in rocker cover.
Some of the 2000 models have a PCV valve on the back of the valve cover. The other models do not have a PCV valve, but use an oil/air separator instead.
The pcv valve on a 1989 Camaro is located in the top of the valve cover. It plugs into a rubber grommet and is easily replaceable.
It is in the valve cover.
UNDER HOOD, CENTER, UPPER ENGINE AREA, TOP OF ENGINE, MOUNTED IN PASSENGER SIDE OF INTAKE MANIFOLD
THERE IS NOT ONE.
Not sure about the 1989, but 1990-1993 it goes into the valve cover. Look for a hose running to the valve cover and the PCV valve should be what is at the end of it pushed into the valve cover.
Generally you will find a PCV valve somewhere on one of the valve covers, with a hose the connects to it.
When you shake the PCV valve it should rattle. If it does not rattle then it is probably stuck and should be replaced.
In the right rear of the valve cover.