check engine light on 93 90cs

[Joel Lenorovitz]

I'm having some similar problems with my '95 90Q.  I had an O2 sensor fault and
those both got replaced at the 60K tune-up.  Since then I've been getting faults
that there is a fuel mixture error and that the fuel trim on both banks is too lean.
 Not only that, but when stopped at a light it now tends to briefly drop to a very
low idle and even stall out once in a while.  The consensus among several people is
that there is a slight vaccum leak causing this condition.  One mechanic
hypothesized that the now-working O2 sensors are trying to correct for this
"erroneous" condition thereby causing the stalls.  Incidentally, I notice that what
triggers my Check Engine light most predictably is when the engine goes to idle as I
decelerate from highway speeds at an off ramp.  Hopefully we can put our head
together and solve this one.  Maybe it's a Y2K bug in the ECU finally manifesting
itself in everyone's 90.  Let me know what you come up with.

Joel

P.S.- Can someone tell me the final word on the location of the servotronic steering
device(?).  I missed much of that thread so write me back off line on that if you
have any info.  Thanks


Message: 19
Date: Mon, 29 Jan 2001 18:56:29 -0800 (PST)
From: "BRIAN O'NEILL" <briano_72 at yahoo.com>
Subject: Re: check engine light on 93 90cs
To: Frank and Mary Avantaggio <avantagg at lincoln.midcoast.com>,
        quattro list <quattro at audifans.com>

my car does the same darn thing too !!!! it has code
2114, some stuff to do with the egr valve vacuume. i
check all the hoses i could see today and couldnt find
or hear any loose ones. mine is weird too, i let my
car warm up at work,anywhere from 5 to 15 minutes
(sometimes i forget its running) and the light comes
on at the same spot while im driving home-like some
kinda forcefield turns it on ?!?!? ill be checking
replies and if you find what is wrong with yours let
me know !!!!

                                  brian o'
93 90 cs
90 80 
88 944 turbo s ( painted and now for sale )
--- Frank and Mary Avantaggio
<avantagg at lincoln.midcoast.com> wrote:
>      recently the check engine light in my 93 90
> quattro has been going on
> and off with a mind of it's own. only after the car
> is warmed up, it seems
> to come on. when it does come on it stays on for
> time periods ranging from
> a second to 5 minutes. my oxygen sensors where just
> replaced today and the
> light still comes on. i was told that the
> rreplacement would probably solve
> this problem.....unfourtunatly this was not the
> case.......does any one out
> there have any ideas to this puzzling problem??
>    thanks
>   -chris
> 


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