If the 1991 lumina's engine is the same as the corsica LT's, then location is pretty easy to find. In the back of the engine, located in the middle, a few inches down, should be a rubber hose about 3/4inches wide. This hose goes into a gromment in the valve covers. It should be easy to pull out by hand. At the end of the hose will be the pcv valve which should resemble a car cigarette lighter. Shake it. If it rattles then it should be okay to go. If it doesn't, then replace. Good luck. The following web address will lead you to an image of the engine and the area you will find the pcv valve in. http://img113.exs.cx/img113/182/pcv-valve.jpg
The PCV Valve on a 1995 Chevy Lumina 3.4L is located in the line that comes off the rear intake manifold between the throttle body & the intake. This line is on the back side of the throttle body and intake manifold where the two come together and make a "L" shape. The middle of the "L" shape has a approx. 1/2" rubber line that comes out and is held in place by a sqweeze tight mettle clamp. If you follow that line for aprox. 6" you will come to the PCV Valve. Mine was covered with another 1" hose over the top of it, so you will need to remove that carefully. The bottom of the PCV Valve is a plastic line. You do not need a L shape PCV valve, my 3.4L lumina needed a straight PCV Valve. it only took me 4 hours to find it :(
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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