Xelo

Hello, Sorry for bumping your thread, I got here from a Google search :). I hope I am not doing something against the forum rules, although I do not speak Polish :). If this issue has been addressed elsewhere with already answered questions, please point me to that topic. Thank you in advance. >>>>> As for the CCV issue regarding the M54 engines: I am planning to do this modification also (including a catch can) but after days of studying I've stumbled upon one issue that has not been adressed (or addressed too little). There are 2 versions for any PCV system: open and closed. Open ones are venting the blowby gases to athmosphere, closed ones (as in this case for the M54s) are venting the "filtered" air back into the engine through the intake manifold. Now comes problem #1: this "filtered" air is not measured . MAF measures air coming through the intake manifold, but the one coming back from the valve cover through this modification is routed back into the IM AFTER the MAF (through distribution cover) - so there is a surplus of air going to the cylinders, although the ECU has measured less and O2 sensors will measure more. This will cause crazy fuel trims. Any schematic of closed PCV system on the net is described as having a venting hose coming from the air filter (so metered air) which allows the crankcase to breath. See examples below: https://ibb.co/HTcNL3N https://ibb.co/wM1D6HV https://ibb.co/wNg1MRZ https://ibb.co/Bg3vBCW M54 engines: OE system does not have a supplementary/aditional valve cover (VC) breather as I remember. The only port of the VC is the one going to the CCV. So this raises so many questions: 1) Why does the OE M54 CCV system does not have a breather allowing the crankcase to draw air from the intake 2) Would this breather be a good idea as it still allows vacuum but also protect engine seals ? 3) Where would the best connection for a breather be ? I have heard a case where a Polish colleague of yours (maybe even from here) connected a hose from the vacuum F connector in the intake boot to the oil dipstick. If so, would this need a non-return valve (for the probable case of oil from the crankcase/oil pan would be sucked up and flood the intake) ? This is my plan for the CCV delete. I would appreciate any ideas/hints: https://ibb.co/sVm8QK8 PS: As I have seen many of you are looking for an appropriate PCV valve similar/identical to the ones used in USA (FV345 or Duralast), I would point you to a cheap/simple one to be found in EUROPE as well: part# 94580183 - from GM/OPEL/DAEWOO models. Costs about 4-5EUR. https://ibb.co/Y2Np8Tx PPS: I do not know why the forum did not accept the BBCodes for the images, I have edited and kept directlinks only. Please click them directly.