poor running 88 5ktqa - even MORE info

[Livolsi, Stephane]

Well, maybe a big mistake on my part but I have been avoiding that.
Seems to me it would be the most unpleasant of all diagnoses.
However, the fuel pump is a fairly new Pierburg unit and not highly
suspected.  I am suspecting problems in the fuel distributor, but the
injectors also are fairly new (about 1 year old) and ever since I've
owned the car I only run Chevron 94 gas.  

Oh yeah, I forgot to mention that last nite when checking the crankcase
vent hose, the metal tube was really choked up with crud.  Interestingly
it was fairly dry and a rusty brown color. There was a lot of it, but it
hadn't totally closed the passage, and I gave it a good cleaning out.

Joshua, can you give me some pointers on where and how to check the fuel
pressure?  I do have a fuel pressure gauge, but have never used it.

> -----Original Message-----
> From: Joshua Van Tol [mailto:josh at spiny.com] 
> Sent: April 1, 2004 10:34 AM
> To: Livolsi, Stephane
> Subject: Re: poor running 88 5ktqa - more info
> 
> 
> Have you tested the fuel pump pressure and delivery rate yet?
> 
> On Mar 31, 2004, at 3:32 PM, Livolsi, Stephane wrote:
> 
> > Thanks Ameer and all others who replied.  You've given me 
> some great 
> > ideas that I will be checking out tonight.  At lunch time I 
> drove the 
> > car and again for the first minute or so it actually 
> accelerated like 
> > a turbocharged Audi, then fell back into it's old tricks.  
> We will be 
> > fixing the problem tonight and I'll let the list know what we found.
> >
> > Stephane
> >
> >> -----Original Message-----
> >> From: quattro-bounces at audifans.com 
> >> [mailto:quattro-bounces at audifans.com] On Behalf Of Ameer Antar
> >> Sent: March 31, 2004 1:04 PM
> >> To: Livolsi, Stephane
> >> Cc: Quattro List
> >> Subject: Re: poor running 88 5ktqa - more info
> >>
> >>
> >> I'd strongly suspect a vac. leak somewhere. I had a similar issue 
> >> before where the car would run ok fro a few miles and then totally 
> >> crap out the next. It turned out to be a hose had fallen 
> apart right 
> >> next to the hose clamp so it was hard to see. Every bum 
> the car felt 
> >> changed the position and sealing of the hose, so the car would go 
> >> from bad to worse and back. Although it might be possible, esp. if 
> >> several sensors going bad, I doubt sensors would cause a severe
> >> running issue as your stating. O2 sensors and temp sensors
> >> only have a limited affect on the fuel delivery. The main
> >> deciding factor is the air-flow plate and the rest is just
> >> adjustments. If there's any sort of vac. leak, the plate will
> >> not go high enough to deliver the right amount of fuel.
> >>
> >> In any case, it's a really good idea to test sensors when your 
> >> troubleshooting so you can eliminate possible problems, 
> but I'd start 
> >> to look carefully at all your intake hoses. Carefully 
> remove each one 
> >> b/c cracks/tears usually don't stare at you in the face... they 
> >> usually hide on the bottom or near a hose clamp. Who knows, the 
> >> problem could be an ECU malfunction, but you need to be 
> sure you can 
> >> eliminate certain possibilites. good luck.
> >>
> >> -Ameer
> >>
> >> ----Original Message----
> >> Date: Wed, 31 Mar 2004 11:06:29 -0600
> >> From: "Livolsi, Stephane" <Stephane.Livolsi at investorsgroup.com>
> >> Subject: poor running 88 5ktqa - more info
> >> To: "Audi Quattro List" <quattro at audifans.com>
> >> Message-ID: 
> >> <A9CCC2FEA3353D4B9BB3D1DC8939777004CC176B at igamail3.iga.bz>
> >> Content-Type: text/plain; charset=us-ascii
> >>
> >> I copied my original post for reference.
> >> Last night I unplugged the o2 sensor and drove it.  Same problem - 
> >> cutting out/missing under acceleration - actually felt 
> worse which is 
> >> probably good, right? meaning the o2 sensor is working?
> >>
> >> Now this morning was interesting.....
> >> Slightly colder this morning (about 0C) and the car started fine 
> >> without giving it any throttle, but when I did give it throttle it 
> >> sounded like an air colled VW and there was some
> >> (gulp) bluish smoke which cleared up
> >> (valves?)  Anyway, heading down the road the throttle felt more 
> >> responsive than yesterday and lo and behold I could 
> accelerate very 
> >> nicely with heavy throttle application.  This lasted for about 2 
> >> minutes and then the cutting out/missing returned.
> >>
> >> So, what changes in the first couple of minutes of engine 
> operation?  
> >> O2 sensor is in open loop until it warms up but it has the heater 
> >> wire so it should only be a few seconds before it goes to closed 
> >> loop, right? What else is there?
> >>
> >> I am strongly suspecting that temp sensor referred to in the other 
> >> posts for the 89 90Q.  Is it the a single wire sensor at the upper 
> >> rad hose on the engine, above the 4 wire MFTS?
> >>
> >> Stephane
> >>
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> >>
> >>
> >
> > 
> 
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