'95 90Q - besides injectors, ISV, or vaccum leaks.....OR O2 sensors..........

[Joel Lenorovitz]

I forgot to mention that the O2 sensors were just replaced and I get no O2 sensor
codes so I think we can tentatively rule that out.  I used to be able to
semi-reliably reproduce the condition when decelerating in gear from high speed
after a prolonged run on the highway (high vaccum condition, I imagine).  Lately,
however, it seems to be far more sporadic.  Unfortunately, the best predictor of
when it will happen is at the moment of impending joy that I've got the problem
fixed and then my hopes come crashing to the ground.  On the plus side, I experience
virtually no driveability problems at any time, light or not.  I'll the things you
all have suggested, but I'm always open to more hypotheses.  Thanks,

Joel

I do put more than my fair share of miles on the car in a month so it sounds like
the oil consumption is reasonable.


--- Todd Young <tyoung at wamnet.com> wrote:
> When you cleaned the ISV, did you clean out the crankcase breather
> tubes? These are the tubes that go into the plastic plenum just before
> the throttle body. It also helps to clean out the vacuum runners in the
> plenum and replace the vacuum hose that goes from the intake manifold to
> the plenum.
> 
> Otherwise, as Elliot asked, when was the last time the O2 sensors were
> replaced?
> 
> Have you checked the EGR valve, it's been known to carbon up and cause
> codes.
> 
> My V6 only uses about 1/2 quart every 1200 miles or so. I put in maybe 1
> and 1/2 quarts between oil changes.
> 
> Joel Lenorovitz wrote:
> > 
> > '95 90Q with recurring check engine light due to lean fuel mixture in banks 1
> and 2
> > 
> > I've had the injectors replaced under the recall, cleaned the ISV (which seemed
> to
> > cure my intermittent idle drop problem), and examined all I can see for vaccum
> > leaks.  Interestingly, even if I intentionally create a huge vaccum leak I
> cannot
> > reproduce the condition that sets off the light.  What else could be causing
> this?
> > What else can I check?
> > 
> > Also, how much oil does the V6 12v typically consume?  I don't see any evidence
> of
> > leaking, but the level sure goes down rapidly - perhaps 1/2 to 1 quart per
> month.
> > 
> > Thanks for the advice,
> > 
> > Joel
> > 
> > __________________________________________________
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> -- 
> ------------------------------------------------------
> Life's a beach. Dig your toes into the sand and enjoy.
> ------------------------------------------------------
> Todd Young 		WAM!NET Inc.
> tyoung at wamnet.com	655 Lone Oak Drive, Bldg #A
> 651-256-5051		Eagan, MN 55121
> 800-585-1133 ext.5051	http://www.wamnet.com/
> '93 Audi 90S (|___\====OOOO====/___|)


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