5K won't idle, stalls, won't start for a few minutes but drives above idle

[Fred Munro]

It might be a bad fuel pump check valve, Christoph.

Put a fuel pressure gauge on it, run the fuel pump to pressurize the system,
and shut the pump off. The system should hold pressure for at least 5
minutes. If it leaks down, replace the check valve. A bad check valve will
cause hard/no start and very rough idle after starting.

HTH

Fred Munro
'94 S4


-----Original Message-----
From: quattro-admin at audifans.com [mailto:quattro-admin at audifans.com]On
Behalf Of cjcasati at hotmail.com
Sent: September 12, 2002 6:06 PM
To: quattro at audifans.com
Subject: 5K won't idle, stalls, won't start for a few minutes but drives
above idle


Hello all,

I seriously need help, wife is due with 1st child in 10 days and the 90 is
down with the radiator cracked, now the 5K is acting up:

At lunch the car was hard to start, then drove fine. Tonight it started but
wouldn't keep idle. Drove a few hundert feet and it stalled at an
intersection, refused to start. Pulled the codes, there were none, hammered
around on the ISV, no luck. Then it started up hesitantly and I managed to
drive it back to the house, above idle it drives fine. At the house I
stopped, it wouldn't idle and won't start up for a while. Is this fuel
related? I hear the pump humming in the back at the usual noise level, plus
it drives above idle, basically when you let it idle it will cut off and
will not start for a few minutes.

Help! Any pointers are appreciated, in my 2 years on the list I don't
remember reading about this combination and the archives don't give anything
that would make sense. Injectors flooding the engine at idle?

Thank you so much for any help

Christoph
86 5k 173K
88 90 150K
Richmond, VA