Audi 5000CS Quattro Turbo - Stalling issue!

ign switch? loose intake boots? residual fuel pressure leaking down too fast!

i had a 200 quatro with the same symptom. it turned out to be a hole worn into the underside (hard to see) of a 2" rubber hose leading from the top front of the engine compartment to the air intake. i think what was happening was that the computer was compensating for the hole at times (after you got it running) but then had difficulty maintaining the right settings at other times (slowing down comming off the highway)

hope this helps - it was a bear to figure out

Fuel pump relay?

Quite easy to eliminate by replacing it with a jumper wire (across the 2 large terminals). For safety reasons do not leave the jumper wire in place as the fuel pump will be running all the time it is there.

G.

The fuel pump normally runs constantly when the engine is running and it will still shut off when the ignition is turned off.

The risk is that in an accident the key will be on and the engine stopped and with the possibility of leaking fuel there is the potential for a fire that will continue to be fed. Not a good idea but the test is still valid to see if the relay is the problem,

The issue could be a number of things but vacuum leaks, fuel pressure issues an ignition problem due to hall effect module on distributor are places I could check.

Replace fuel filter, Clogged screen > In article