on a 1998 Pontiac gan am ,they do not have a pcv valve.
The pcv valve is located on one of your valve covers.It will have a black hose running to your air breather
THERE ISNT ONE THERE IS A PCV VENT LOCATED AT THE REAR OF THE ENGINE
You can find the PCV valve beneath the MAP sensor located in the plenum at the right front of the engine.
They didn't make and Si in 1998. The PCV valve is on 1998 Civic SI's are located on the bottom of the intake manifold. It is acessed from the bottom of the car, you have to remove the oil filter to reach it.
driver's side by rear tire
On the 2000 Firebird 3800 V6, the PCV valve is under the MAP sensor. It is on the top of the engine on the upper plenum.
The PCV is usually located in the valve cover(s). They just slip into a rubber grommet; no tools required.
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The PCV is screwed into the front of the intake manifold, top right and has a hose coming out of it.
The PCV valve is located on the side of the engine closest to the radiator. It is accessed between the two exhaust pipes closest to the drivers side.
The PCV Valve on a 1998 Suzuki Sidekick is located on top of the manifold. There is a small plastic cover that can be taken apart by pulling sideways on it. It has two or three hoses attached and is sometimes colored blue.