I was trying to help someone find the EGR vlv. on their '14 Impala LT with the 3.6L since they said they're being quoted $3,400 dollars to clean it since they have to pull the engine. I haven't found the part listed in two places and have only read one mention of an EGR vlv. Do these have an EGR vlv? Is it buried/not readily accessible?
(BTW, another commenter wrote he believed low- and ultra-low-emission vehicles with VVT may not use a valve and obtain the goal by valve overlap (which doesn't seem acheivable to me)).
There is no EGR Valve on a LFX 3.6L or most any engine with variable valve timing. In VVT engines, the exhaust cam timing is retarded far enough that exhaust is drawn back into the cylinder at the beginning of the intake stroke for EGR.