'95 90qs: Cut Out, Hard Starts, Stall

Thu Aug 31 09:05:56 EDT 2000

On the 12valveV6, you WILL need a good O2 sensor socket. Lisle makes a good one,
BTDT. Broke a more expensive one. The O2 sensors are buried, the only way to get
at them is with an O2 sensor socket, a U-joint, and either a good long
extension, or a couple of extensions. I had sprayed mine down with Liquid Wrench
and still had to use a 21 inch breaker bar to break them loose.

Bill Rowe wrote:

> tom,
>
> bosch sells a generic 3 wire sensor which can be had for under $40.  i have
> a spare in my garage if you need the part #.  just have to splice it in.
> fairly simple to replace in less than an hour, i've done it in under 30
> minutes after a few beers.  no special tool required, just a 22mm box wrench
> and a crow bar or pipe for leverage.  easier if you remove the air box but
> i've done it w/o removing it, also after having a few beers.  even if it's
> not the culprit it never hurts to replace it especially if you have no
> history.  it would cost you more than $39 just to have a mechanic look at it
> and chances are you'll waste your money cause he won't find the culprit.
> check and replace/clean/adj all the simple to get to and inexpensive parts
> like the air/fuel filters, plugs, cap & rotor.  again, w/o history it
> doesn't hurt to replace 'em.  good luck
>
> bill
>
> -----Original Message-----
> From: quattro-admin at audifans.com [mailto:quattro-admin at audifans.com]On
> Behalf Of Thomas J. Donohue, Jr.
> Sent: Wednesday, August 30, 2000 6:39 PM
> To: Doyt W. Echelberger
> Cc: Dan Z. Johnson; quattro at audifans.com
> Subject: Re: '95 90qs: Cut Out, Hard Starts, Stall
>
> Just bought a 91 TQA 20v which is doing similar things at coast-down.
> Entering
> a parking lot, for instance, off the throttle, all of a sudden, the car is
> not
> running.  Can't even tell, except no power steering and the dash is lit up
> when
> I wasn't looking.  An occasional "miss" or momentary lurch when driving
> under
> power has been noted too.  Car has just under 140k and I don't have the
> complete
> history.  Still sound like OXS?  Thanks.  Tom
>
> "Doyt W. Echelberger" wrote:
>
> > I'm not talking as an expert or even an owner of such a new car, but when
> > my 87 5kcstq developed the described behaviors, it was eventually
> diagnosed
> > as a failing oxygen sensor. And all the problems vanished with a new
> sensor.
> >
> > The oxygen sensor on my car failed progressively. Eventually, it only
> > worked now and then, making for erratic performance that varied between OK
> > and terrible.
> >
> > The failure mode resulted in gradual creep of the mixture toward the rich
> > side. When it was too rich, it would lose power and sputter and I'd panic
> > and look for a place to pull off the road to get out of the way of
> traffic.
> > Sometimes it would die at a toll booth, and I'd have to let it sit for a
> > few minutes before it would restart.
> >
> > Here is a test. When it sputters, FLOOR IT. Flooring it opens up the
> > throttle and allows large amounts of air to enter, which temporarily
> > provides air to the rich mixture setting, and the power returns for a
> > little bit.....3-4 seconds, or as long as the throttle is wide open.
> >
> > If flooring it helps, you are probably dealing with a rich mixture, and
> > that might be due to a failing oxygen sensor. Then you can go to the
> > expense of having a mechanic use a special instrument to test the cycling
> > frequency of your oxygen sensor. Or if your sensor is over 30k miles old,
> > you can just replace it.
> >
> > Doyt Echelberger
> >
> >  >>>>>>>>>>>>>>>>>>>>>>>>>>>
> > At 12:04 PM 8/27/2000 -0400, you wrote:
> > >Hello,
> > >My 1995 Audi 90q (73k miles) has a real problem. It started
> > >as the occasional stall at idle, then progressed to quick,
> > >intermittent cut out while driving. Now, at road speeds, the
> > >engine will sputter rapidly and die altogether, and be
> > >nearly impossible to restart. Car backfires slightly. After
> > >letting it cool a bit, I can restart and sometimes run for
> > >1/2 hour or more with no problems.
> > >At first, I thought that i had gotten a bad tank of gas. Ran
> > >some methanol through, with limited, short-term success. may
> > >not have helped at all, in retrospect. I am two tanks of gas
> > >past that first suspect tank. I have run injector cleaner
> > >through before and after this started. All panel indicators
> > >are normal.
> > >Any ideas?
> > >
> > >-DanZ
> > >
> > >_______________________________________________
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--
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Life's a beach. Dig your toes into the sand and enjoy.
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Todd Young              WAM!NET Inc.
tyoung at wamnet.com       655 Lone Oak Drive, Bldg#A
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'93 Audi 90S(|___\====OOOO====/___|)