Rough Running 90q

[Richard J Lebens]

This isn't a 20V is it?


--- "DePenning, Charles [EPM/MTN]"
<Charles.DePenning at EmersonProcess.com> wrote:
>  Well, I think I can scratch the cat off the list as possible
> problems to my
> poor running 90q- this morning I took the cat off at the exhaust
> header and
> started it up- same exact behavior as before.  Plus, the cat looked
> really
> good from the front anyway. This is driving me nuts- there are only
> so many
> inputs to the equation to make the thing at least run decently... 
> 
> Bad OXS?
> Vacuum Leak?
> 
> Any BTDTs?
> 
> Thanks for any help!
> 
> Charley
> 
> '89 90q
> '84 4kq
> '83 5kT
> 
> 
> 
> 
> -----Original Message-----
> From: TEX  TERRY,  II
> To: Charles.DePenning at EmersonProcess.com
> Sent: 3/19/04 8:00 AM
> Subject: Re: Rough Running 90q
> 
> Hi Charles  -  I receive the digest form of the list, so little bit
> late
> in
> responding.
> 
> Did you ever get any helpful response (to your message below), or do
> you
> still have the problem?  Since you said that you had very little
> difference
> (in engine running) when you pulled each spark plug lead, I would
> guess
> that all the cylinders are firing.  This would also mean that you do
> not
> have any clogged injectors.  The build up of the back pressure,
> caused
> by a
> clogged catalytic convertor, can definetly give the same symptoms you
> are
> having.  I had this happen on my '83 5kt.  I disconnected the cat,
> cleaned
> it out, put it back on (just for test purposes), and it made all the
> difference in the world.  Due to many different items coming up, I
> have
> not
> been able to finish working on the car (think I have a faulty cold
> start
> injector now), but hopefully I will have it back on the road this
> summer.
> 
> Tex Terry, II
> 83 5kt sedan (non-quattro)
> Franklin, PA  USA
> 
> > Message: 4
> > Date: Thu, 18 Mar 2004 11:24:05 -0600
> > From: "DePenning, Charles [EPM/MTN]"
> > 	<Charles.DePenning at EmersonProcess.com>
> > Subject: Rough Running 90q
> > To: "'quattro at audifans.com'" <quattro at audifans.com>
> > Message-ID:
> > 
>
<619264F5DAF02344BC3B7F279A474245071684C8 at mxsfrcomtn1.na.emersonprocess.
> com>
> 
> > 	
> > Content-Type: text/plain
> > 
> > Hiya, I'm looking for some technical help with my '89 90q.  Here
> are
> the
> > symptoms:  Starts ok cold & warm, but runs very rough, like it is
> missing
> on
> > one or more cylinders.  It idles ok some of the time, then devolves
> into
> > roughness, shaking, sputtering.  If I rev it up a bit and hold the
> throttle
> > at a set position, say, 2500 rpm, it smoothes right out, but
> getting
> there
> > is rough.  Driving- no power.  Moving it around my driveway is an
> exercise
> > in patience and lots of revs.  This happened suddenly-  I was
> driving
> at
> > highway speed and it just started this behavior and it's been this
> way
> for a
> > couple of weeks.
> > Here's what I have checked:  Pulled a 4444 from ECU.  Fuel system
> pressure
> > great, good bleed down pressure.  Great compression for 234,000
> miles,
> > across all cylinders.  Plugs look good.  Pulled spark plug wires
> off
> one
> at
> > a time, no discernable difference.  Air filter ok.  Pulled oil
> filler
> cap
> > off, didn't die right away, but started getting there.  Visually
> checked
> > vacuum system for leaks (not that that says much).  Tried the
> propane
> torch
> > vac leak detection method- no increase in idle speed noticed.
> > 
> > So, I've got a couple of ideas:  blocked cat, big vacuum leak that
> I
> haven't
> > found, one or more plugged injectors.  The fact that this started
> so
> > suddenly is what is throwing me a little into the realm of blocked
> something
> > or ripped hose somewhere.
> >   
> > Whatdya think?
> > 
> > Thanks in advance!
> > 
> > Charley DePenning
> > '89 90q
> > '84 4kq
> > '83 5kT
> > 
> > 
> > ------------------------------
> > 
> _______________________________________________
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> quattro at audifans.com
> http://www.audifans.com/mailman/listinfo/quattro


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