ME/ Wagner PCV

PCV is only supposed to 'vent' at part throttle, should be sucked closed at idle and spring pressure closed at WOT. stock PCV are dialed in to specific camshaft profiles and vacuum levels so its no wonder that stock PCV valves dont work great on a cammed motor that has lower than expected vacuum at idle as it seems to the PCV valve that you are at part throttle and opens, vacuum leak! That valve has both closed modes adjustable. adjust idle side so its closed at idle, and somehow adjust the WOT side so its open at WOT (easy as that is what it rests at out of the box) looks like a nice piece. $?

EGR---(not related but a similar working issue)


My mazda (and a few others I suppose) had a EGR that had a threaded pintle in it (small hex at base of shaft) , you could turn it and it would lengthen the pintle, delaying the off idle break point. I found mine to be leaking at idle so I turned it up a little and BAM, idle was smooth as silk again. That was the most satisfying repair, just a turn and the mystery idle issue was fixed.