There is a great write-up with pics on how to change the PCV valve at: http://macgp.clubgp.com/howto/pcv/pcv.html Hope this helps. G
I KNOW TRYING TO LOCATE THE PCV ON 2004 GTP IS FUSTRATING, I HAVE THE SAME PROBLEM! SPEAKING TO THE PONTAIC DEALER I WAS TOLD IT IS LOCATED ON THE DRIVERS SIDE, ON THE SUPER CHARGER. GOOD LUCK!!!!
The PCV valve is located under the MAP sensor on a 1990 Pontiac Grand Prix. The MAP sensor is in the upper plenum.
In the valve cover at the right front corner
For pics and instructions for the Grand Prix GT check out. http://macgp.clubgp.com/howto/engine/pcv/gt/pcv.html . "G" It is in the intake behind the throttle boly.
PCV Valve LocationI just changed mines recently. Remove the top cover. It should be located on the left side (passenger side) next to the fuse box. It has a plastic covering that reads sensor. Look for the wiring. That's correct if its a Grand Prix GT. If you have a Grand prix GTP supercharged engine, the PCV valve is under the black plastic engine cover which comes off by removing the oil filler plastic tube and lifting up and forward. Look to the back right corner of the intake manifold when standing in front of the car and you will see a small metal cover with two bolts. Inside is a gasket, a spring, and the PCV valve. Be careful and keep it clean.
between throtle body and firewall
The PCV is a small metal cylinder the is plugged into the top of the valve cover and has a 1/2" coming out the other end.
Try this link for location and procedure to change:http://macgp.clubgp.com/howto/engine/pcv/gt/pcv.htmlHope this helps!Slim
For all GTPs 1997-2003, the first step is to remove the cosmetic supercharger cover. At the rear of the motor, on the driver's side of the vehicle, there is a small plate etched with "PCV." Use a small socket and ratcher to unscrew the two bolts, and the PCV valve will be exposed. The PCV valve may stick, so you may need needlenose pliers. Remove the valve, and do not lose the corresponding spring. Simply put the new valve with the spring in and reinstall. Hope this helps!