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R33 RB25 PCV grommet issues . Hi all , just a tip for those looking for vacuum/boost leaks on these old girls . For a while I've been replacing water and breather hoses on the 21 yr old boat and found an issue that had teased me for ages . Silly tuning issues mainly right down low and a bit more boost lag than I thought I should have . Amongst other bits I had Kudos send me a genuine PCV valve grommet and hose . The old valve had been loose in the grommet and when I removed the original one the bottom third of the seals lip was missing . Not surprisingly the hose was old and hard and may have been leaking under boost as well . Feels better to drive and shows lower manifold pressure at part throttle , goes into positive pressure a bit more easily and the slight lean spikes off idle are almost gone . "Valve Control" Pn 11810-21U00 , "Insulator-PCV" Pn 11812-41B00 , "Hose - Blow By" Pn 11823-AA510 . Grommet same on R34 GTt . Grommet around $8.80 , kit inc PCV $44 , all three around $70 . Something to keep an eye on cheers A .
