'94 Le Sabre PCV replacement for dummies...
I just had the PCV valve replaced on my 1994 Le Sabre. This is a real pain to figure out, so I got some professional help, and thought it might be useful to share the technique with everyone. So, here's how to find and replace the PCV valve on a '94 (apparently, some of the other 3800 engines manufactured close to that year are very different, so no promises on this working for anything but a 1994 Le Sabre...): Carefully remove the plastic cover (the one that says "3800" with "Tuned Port Injection" written underneath) off the top of the engine. Said cover clips onto to the shiny metal rails in about 4 or 5 places. As you remove the cover, notice that on its left side, it clips on to an undistinguished-looking round rubber or plastic assembly. (The cover has a short, flat edge on its left side which covers and attaches to the assembly, on the assembly's left side) The assembly is on top of the engine, just to the right of (or "behind") the pulleys and belts on the "front" or left of the sideways-mounted engine. Inside this roundish assembly is the PCV valve.
Twist the cover off of the assembly, and the PCV valve is found underneath the cover. Hallelujah!
Look at your new replacement PCV valve. It has a long neck, going into a cylindrical body. You will notice a flange or "lip" around the base of the body. This is what the spring sits on. Take the old valve out with a pair of needle-nose pliers, and replace the spring onto your new one. Be sure to keep the o-ring which you will find around the old PCV valve, and re-install it on your new valve.(Otherwise your engine won't run properly!) Also be sure to check the o-ring around the mouth of the opening in the assembly-but it's probably OK-mine was. Put your new valve with the existing spring and o-ring back in the hole, twist the cover onto the assembly, then re-attach the plastic cover to the top of the engine. Voila! Best of luck, and my thanks to the fine folks at Trinity Motors here in Wichita for their assistance with my PCV valve replacement!