[s-cars] Cutting out at speed

Douglas Fifield douglas.fifield at gmail.com
Wed Aug 19 20:14:27 PDT 2009

I had the same problem with my 95.5 S6.  Turned out to be a bad chip
in the ECU.  I had recently upgraded to an MTM +1 set up.  Anderson
Motor Sports replaced the chip and all has been well.


On Mon, Aug 17, 2009 at 11:47 PM, mike claire<mike.claire at gmail.com> wrote:
> Thanks Randy, I replaced the fuel pump about 20K ago.  I don't suppose
> that's reason to rule it out.
> But somebody here doubted my theory about the fuel pump relay, since the
> cutout is instantaneous.  I think he's right - if the fuel pump relay cut
> out (or if the pump itself were weak) the car would need a few seconds to
> starve, and then die.  I wouldn't get the driveline shock I get when the
> power cuts out in an instant.
> Bob Myers says he had my exact problem, and it was a bad 1.8T ignition
> harness.  I don't doubt him, but I don't understand how a coil harness can
> fail that way - going from 5 cylinders to 0 instantly.  But I should
> probably check my grounds.
> I'm going to jiggle the ignition switch next time this happens.  Anybody
> ever had an ignition switch give my symptoms?
> On Mon, Aug 17, 2009 at 8:54 PM, McCall, Randy <rmccall at nexant.com> wrote:
>> Date: Mon, 17 Aug 2009 16:34:49 -0400
>> From: mike claire <mike.claire at gmail.com>
>> Subject: [s-cars] Cutting out at speed
>> To: "S-Car-List at Audifans.Com" <s-car-list at audifans.com>
>> Message-ID:
>>        <d219f42d0908171334h27a6212ao3c0b44ff65d89787 at mail.gmail.com>
>> Content-Type: text/plain; charset=ISO-8859-1
>> Sorry to posting a question before even blinking out the codes.  But I'm
>> 40
>> miles from home, and I have a problem that's suddenly getting a lot
>> worse
>> very fast.  I'm about to get back in the car and hopefully get it home
>> before the traffic's too bad.
>> The car suddenly and without warning shuts down while driving at steady
>> speed on the highway.  I can't be sure if it's ignition or fuel, but
>> there's
>> no stumble - it goes from running great to not running at all.  So far
>> it
>> has only happened during steady cruise at 75/80 mph.  Speedo and tach
>> still
>> register correctly after the stall.  No CEL.
>> I can restart the car and resume travel before the car even slows to 65
>> mph
>> - it starts right back up like there was never a problem, no matter how
>> hot
>> the car is, and it ONLY fails while driving.  So I do NOT suspect the
>> CPS
>> (which was replaced about 40K miles ago).
>> I'm thinking fuel pump relay.  Looking for ideas - what else could
>> behave
>> this way?  I'll blink codes tonight and report.
>> Mike
>> _________________________________________________
>> Mike
>> I had a 200 10V that exhibited your symptoms - flying down the freeway,
>> alls well, all of sudden, nothing, nada, pull on over before you get
>> hit.  Wait 10 seconds, engine starts fine.  Kept doing that all the way
>> back home (only 10 miles or so), and got worse as I kept driving.  Fuel
>> pump change put things back to rights once I was home and could steel
>> myself to go fuel tank diving.
>> -Randy
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Douglas in MN
95.5 Audi S//6 Avant
73 BMW R60/5 mit Toaster Tank

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