PCV valve

[corning_d3]

The EGR valve also reduces knocking/pinging by reducing combustion chamber temps, allowing you to run lower octane fuel.

[Fierc3 Kid]

Hmm, I have a 90 v6 auto Corsica w/ 127500 miles on it, and I get bad mileage. I don’t know when the last time an egr valve, or a PVC valve was were replaced, but I could care less about the PVC. Were exactly is the EGR valve, I have looked and looked, and I can’t seem to find it. Is it possible to clean it up instead of buying a new a one?