[Es2] Sport Quattro problem

Miller, Chris chris.miller at infofoundry.com
Mon Dec 6 15:34:56 EST 2004

Hi Colin,
first thought would be a fuel pump issue; I think you've got two, a
transfer pump in the tank, and the external main pump.
I know many of the urquattro guys change the fuel pump relay wiring to
install a second relay back by the pump; the stock wiring activates the
rear relay and the rear relay powers the main fuel pump.  Check the
archives on www.audifans.com and you should see some writeups; was it
rdh? that wrote about it?

The relay is relatively cheap, too.

-----Original Message-----
From: es2-bounces at audifans.com [mailto:es2-bounces at audifans.com] On
Behalf Of c cohen
Sent: Monday, December 06, 2004 3:30 PM
To: es2
Subject: [Es2] Sport Quattro problem

You guys have been kind enough to help shed some light on the mysteries
of the KW engine in the light of your terrific AAN et al performers.  I
wonder if you would take a look at this problem and tell me what you

Starting in the Spring, it would occasionally run rough - as if it was
only running on 3 cylinders, but this was not the case.  More like
cutting out momentarily - would not accelerate but could maintain speed
with very light throttle.  You feel like going to WOT but you know it
will probably die before you get there.  Then just as suddenly as the
symptoms started, it cleared up and ran normally.  This happened in
daylight (no lights) dry but around 28C with the A/C running.  I
switched off the A/C but that did not help.  the shop I work with in TX
thought it was the diverter valve and replaced it with one for a TT. the
problem did not return but the car was not driven as regularly after

In September, after a 300 mile run, 4 track runs and 275 miles home, all
flawless, the problem started again.  This time it got so bad that when
I stopped for a light, it stalled and would not start. There was spark
(checked) but a seemingly no fuel was getting through.  The A/C was on
but I had switched it off well before it stalled.  I had just refilled
and thought it might be bad gas.  I got a tow to the other side of the
intersection and started calling for another tow.  After 15 minutes of
phone calls, I turned the key, yet again, and its started, ran smoothly
as if nothing had happened and home I went.  Warm dry day, 27-30 deg. C.

Later in the same month it happened again but this time it did not stall
and cleared itself up after some nursing.  I then put in a bottle of the
Chevron injector cleaner.

Two weeks ago, I drove a round trip in driving rain with and without
A/C, 20-25 deg C.  No problems.

On Friday I drove it to work (30 miles round trip) and  as I pulled into
my garage that evening, it started running rough again.  Tried to keep
it going, played with all the electrics - but nothing made a difference.
It was hunting, revving to 2000 then dropping to near stall, then back
to 2000 until it finally stalled.  Cold dry day around 14 deg C.  Once
it stalled I could not restart but smelled unburned fuel.  The next
morning the car started as normal - ran smooth.
I am guessing it might be something to do with the fuel pump but it is
not noisy; or filters, which were changed last year.  There is no
workshop manual for this car but I do have the calibration numbers for
the various sensors but do not know where to start.

One suggestion has been the fuel return or the accumulators?

Anyway any ideas would be appreciated.

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