[s-cars] Intermittent cutout

[Robert Myers]

More data, Taka.  I swapped the FP relay into the car from my running 
urS6.  Engine firfed right up and I went for a two mile drive.  Got 
back home and parked the car and left it idling.  Came back after a 
few minutes and the engine was dead.  It again fired right up so I 
went for the two mile run again.  As I drove into my driveway the 
engine died and would not restart.  At least not quickly.  I needed 
to get the car out of the way so my wife could get out so I put it in 
gear and operated the starter.  The car moved about 6 inches and the 
engine started.  I backed the car into the garage and let it 
idle.  It died again but started right up when I tried it.  I let it 
idle and the engine stopped agaim and this time would not start easily.

I pulled the codes using VAG-COM.  Got these codes:
00561 - Mixture Adaptation
         14-00 - Adaptation Limit (Add) Exceeded
00537 - Lambda (Oxygen Sensor) Regulation
         08-10 - Control Limit Surpassed - Intermittent
00519 - Intake Manifold Pressure Sensor (G71)
         17-10 - Control Difference - Intermittent
00513 - Engine Speed Sensor (G28)
         03-00 - No Signal

Speed sensor makes sense - engine was dead.
Cleared codes.  Started engine.  Engine died.  Pulled codes again 
immediately.  Nothing.  No codes.  Attempted to start engine.  CEL 
came on.  Pulled codes again and got only the 00513 code.

Put wife behind wheel.  I climbed into the trunk with a flashlight 
and my DMM.  Measured voltage across FP.  Zero.  Told wife to crank 
engine.  Voltage rose to ~11.7 or so volts and then engine fired and 
voltage went to a rock steady 13.58 volts and held there until engine 
died again (and voltage dropped to zero) after perhaps a minute.  She 
cranked again and engine restarted with same sequence of voltage 
measurements.  Engine died again.  Attempted restart - no 
soap.  Voltage went to and held at about 11.8 volts while cranking 
and dropped to zero after stopping cranking.

In a while I will be going to FLAPS looking for a fuel pressure 
gauge.  I'll be driving the other S6.

OK, what's next?  Chants and incantations to the Audi gods?  Would 
you like to volunteer to serve as the required ritual sacrifice?  ;-)


At 08:04 AM 9/5/2006, Taka Mizutani wrote:
>Bob-
>Check the voltage that your fuel pump is getting- one possibility 
>that I think Dave Forgie has found in other S-cars is that the fuel 
>pump doesn't get a full 14.4V and thus can't work to its full potential.
>
>If the pump has low voltage and then tries to deliver, I could see 
>that you could kill the pump by it trying to run at 100% all the 
>time due to lack of sufficient voltage.
>
>Taka
>
>On 9/3/06, Robert Myers <<mailto:bob at chips-ur-s.com>bob at chips-ur-s.com> wrote:
>
>The fuel pump is brand spanking new - two weeks in the car.  It is
>the second new fuel pump in two months.  :-(  Now, why would my car
>be killing fuel pumps?  Fuel in tank looks OK and no significant
>amount of debris in the tank.
>
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Bob
urS6 with RS2 and other mods for sale: http://chips-ur-s.com/S6.html