PCV flow then effects fuel trims.
We'll test the modified stock PCV for awhile and see if it effects less oil flow into intake, any negtive to engine seals and gaskets and what effects to air/fuel.
Stock orifice type of GM's used 2003 pickups I think the hole is too small and I think the pintel value is safer.
I replaced the original PCV valve with an orifice of 2.4 mm (homemade).
I haven't noticed any difference in fuel trims nor in idle quality.
It was just necessary to reset the PCM and perform an idle relearn procedure.
I have a catchcan between orifice and intake manifold: it doesn't collect more oil than with the PCV valve.
Important: between the orifice and the intake manifold I had to install a checkvalve because the engine is supercharged.
