Re: Re: '90 Coupe Q. Blue Smoke, Help!

[Porsray@aol.com]

Been following the theories on the blue smoke, thought I'd try adding
my 2 cents.

I don't feel rings or valve guides are bad, largely from my own experience
with my Coupe; have been getting approx. 2500 mi/qt since getting the 
car at 19,000 miles and it now has 113,000 on it.  Have never seen blue
smoke with this sort of oil consumption; would think won't see smoke
unless start getting <1000mi/qt.  Also, plugs are always entirely clean.

If this was a Ferd or Chebbie, would suspect something called PCV or
Positive Crankcase Ventilation valve; this allowed oil vapors to be 
reintroduced back into air intake stream for eventual burning.  When the
valve went bad, as I remember, excessive oil was sent to the air intake
and consumed.  Cannot find a similar valve on the 20V; all I see in the 
shop manual is a pipe connection from cyl. head to plenum upstream 
of throttle plate.  Suspicion is that there is a vent or vacuum line that
isn't
right, or else seal on oil filler cap is damaged thereby affecting crankcase
pressure.  

Ray Calvo (porsray@aol.com)
1990 Coupe Quattro

In a message dated 97-03-27 15:41:48 EST, you write:

 > David w Alcott wrote:
 > > ...blue smoke coming out of the tailpipe....
 >
 > Glenn Lawton writes:
 > > Valve guide seals
 >
 > Phil Payne wrote:
 > > At _idle_?
 >
 > Glenn Lawton writes:
 > > Certainly at startup. BTDT twice (two different 20vCQs)
 
 Me too.  But this was a case of a warm car driven some distance to a
 test station and _developing_ blue smoke at idle.  Doesn't sound
 like valve guides to me.  I expect to see valve guide smoke at
 startup and gear changes.
 
  Phil Payne