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

Thu Aug 31 11:14:27 EDT 2000

I managed to get the O2 sensors out with a 22 mm deep socket, a long breaker bar,
and an 18" adjustable on the end for leverage. Had to cut the wires close at the
sensor. On the right hand side, the trajectory of the sensor is right through the
ABS unit! Why couldn't they have angled the sensor a few degrees up, and through a
clear opening? The breaker bar had to tilt a few degrees, but was still able to
crack it loose. The sensor on the left was easy to remove, though.
-DanZ

Todd Young wrote:

> 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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> --
> -----------------------------------------------------------
> 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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Dan Z. Johnson, Editor
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http://www.voicenet.com/~danz/MN/