Where is the PCV valve located on a 1997 Nissan Altima?
The PCV valve is located at the rear of the engine under the intake manifold. It screws into a metal box separate from the engine and about an inch behind it. There is no way to get a wrench onto it. You can find the valve by following a vacuum hose that comes from a rail attached by the bolts that hold the manifold to the head. I don't know how Nissan techs get the thing off unless there is a special wrench. It looks like the intake manifold would have to come off. I found the thing by going to Nissan and looking at their parts diagram on their parts computer.
Fuel pump is located inside the gas tank. Fuel filter is located somewhere between the tank and the engine. Answer where is the fuel fillter on a 2002 Nissan altima? The fuel pressure regulator on the 97 is located close to the fuel rail. Can't remember exact location, but if you are standing in front of the car looking at the engine, the pressure regulator is on the left hand side of the fuel rail.