PCV = Positive Crankcase Ventilation
Under low vacuum conditions (such as when the throttle is open) the
PCV valve opens and allows blow-by and other noxious fumes that build up in
the crank case to be pulled into the intake manifold. Under high vacuum
(such as idle) the valve stays closed (unless you really have bad blowby) so
that correct idle mixture is maintained. So long as the valve is operating
correctly it is a "good" thing. Venting the crank case of fumes keeps the
oil cleaner and makes the engine last longer.
Hope this helps.
> -----Original Message-----
> From: Hans Duinhoven [mailto:H.Duinhoven@simac.nl]
> Sent: Wednesday, April 28, 1999 7:46 AM
> To: 'Eric Erickson'; firstname.lastname@example.org
> Subject: RE: beware the obvious......
> Please excuse me, what is PCV?
> Hans - '71 BGT still bleeding
> > -----Original Message-----
> > From: Eric Erickson [SMTP:email@example.com]
> > Sent: Wednesday, April 28, 1999 8:32 PM
> > To: firstname.lastname@example.org
> > Subject: Re: beware the obvious......
> > email@example.com wrote:
> > >
> > > The GT has been running horribly
> > > - using oil and giving off clouds under load - but chatting with
> > > Norm Sippel he suggested the diaphragm in the PCV valve - guess
> > > what......brittle and with a nice split! - fortunately
> Bob had one
> > > and it really has made a huge difference -
> > Been there... done that (PCV stuff gone and all is more
> wonderful now)
> > > Bob reckons the car needs rings
> > >
> > Been there... done that (new rings - and bearings while we
> are at it)
> > > Goes to show you do get lucky sometimes (hear that Eric??)
> > >
> > Hmmmm I am going to assume that dumping a whole lot of
> oil/smoke when I
> > hit 60mph yesterday was just a transient protest at
> throwing her around
> > a race track a few days ago.... and that the loud metallic
> > when idling down from speed in fourth is the same.... (who
> said anything
> > about 'timing'?).
> > Hey, she treated me rough so I did the same (and I am older
> than her).
> > We will see what the doctor says tomorrow.
> > Luck? I don't need no stinkin' LUCK! (actually I have
> forgotten what
> > LUCK is!)
> > Eric
> > '68MGB MkII