oN the 3.5 L V6 model It appeares to be under the silver casing on the F. Right side as you are looking at it. I havnt attempted to pull it out yet but it looks like one thogh.
Under the "sight shield," the plastic engine cover. Remove the two black 13mm nuts, then unhook from the clip on the rear valve cover. The PCV valve is located in the front valve cover, on the transmission end of the motor, opposite the oil filler cap. Check out this picture: 99intrigue.shutterfly.com/headgasket/97#103
The PCV valve on a 1998 Oldsmobile Intrigue is located under the MAP sensor. If you remove the large plastic cover with 3800 written on it and look to the left side of the engine there is a sensor marked (Pressure Sensor) with 3 wires going into it. Unplug that sensor and turn it counter clockwise and lift it off and you will see the PCV valve under it. Here is a picture to go along with my answer. http://autorepair.about.com/library/illustrations/bl795lib.htm
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