This is something that has been occasionally picking at my brain for a long time now. I'm hoping someone here knows why 3.4's don't need an EGR valve?
- Many newer vehicles do away with it because they have variable cam/valve timing that can produce a similar effect to an EGR valve however, 3.4's don't have this feature.
- Maybe it's just because the engine naturally produces very low NOX levels due to a particular combination of compression ratio and valve/ignition timing?
- Maybe the levels aren't actually that low but there are special exemptions on light trucks during those years? Similar to how diesel truck emissions laws lagged 20 years behind gasoline laws until recently?
- No matter what I know it's going to boil down to the fact that the 3.4 just kicks ass, but we all knew that anyway
- Do the 2nd gen v6's have EGR valves?