If the engine is smothe at lower speeds it probably is the tcc in the torque convertor. The egr and pcv both are on the upper engine behind the throtle body on your 3.8 engine.
Where is the heater control valve on a 1994 Buick Regal
On a 1993 Buick Regal 3.1L, the PCV valve is located on the intake manifold. It is situated underneath the MAP sensor.
the pcv should be near the front valve cover
At the top of the engine near the firewall and directly behind the carburetor.
The PCV valve for a 1999 Regal 3.8 is located on the top of the valve cover. The valve pulls out to replace it.
the PCV valve is located on the valve cover of a 1991 Regal Custom. It is plugged in and can be easily changed.
Freon valve on my 1989 Buick Regal Custom 3.1 V-6 located on driver side under the area of battery tray. Hope this helps!
The PCV valve on a 1994 Regal Custom should be located on top of the valve cover. It is a plug in type and is easily changed.
Intake valve and exhaust valve.
How to fix heater in Buick there is cool air ,fan is work .but no warm air
There are two types of valves in an engine. The valves are located in the head. There are exhaust valves and fuel intake valves
Remove each valve cover (four bolts.) Remove the gasket and set a new one in place. Set the valve cover in place and tighten the bolts to spec.