David, It is a PCV (positive crankcase Ventilation) valve and it can cause problem if it gets gummed up and sticky. It should be soaked in petrol every major service ~20K. I just can't recall how the valve is located on the L24 and Steven & the 6 cylinder ppl will know for sure. Underneath the manifolds there will be a pipe coming out of the block with a hose on it that goes to the inlet manifold. The PCV valve is a one way device that shut when there is vacuum in the inlet manifold and opens to suck the fumes out of the sump when there is no vac in the manifold. They usually fail on the vac side and leak so causing rough idle.
I found an article that explains how it works - http://www.hastingsfilter.com/engineering/tsb_94-2r.html Ignore the crap about "you shouldn't clean them" - this crowd are in the business of flogging us a new PCV valve every other service - yeah right. The truth of the matter is they practically last forever. regards Terry -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of David Andrews Sent: Wednesday, 5 June 2002 7:48 PM To: [EMAIL PROTECTED] Subject: L24 smoke.. PCB valve? G'day All, I got my old man to drive the my 240Z and I followed him to see when it blew smoke, and it blows absolutely none, as in not a whisp, unless you give it the absolute boots and then it does this big dump of smoke. I am also not convinced its coming out the exhaust, my old man said it might be something called a PCB valve? He said if this is jammed the sump may be pressuried causing it to leak out somewhere then fall onto the exhaust or whatever.. I dunno. But I do know its using around 4L of oil every 1000km or so. Is the PCB valve thing a possibility? And can anyone be bothered quickly explaining how/why it works and what i should do to check & replace it. Thanks, Dave --membersozdat------------------------------------------------------- OZDAT Mailing List Please Note:- Send (un)subscribe requests to [EMAIL PROTECTED] Send submissions to [EMAIL PROTECTED] No unauthorised redistribution of this email http://www.ozdat.com/ozdatonline/index.htm http://www.ozdat.com/ozdatonline/listindex.html http://www.mail-archive.com/[email protected]/ ---------------------------------------------------------------------
