[s-cars] ARGH!! Stalling at idle

[Mark Pollan]

Hi All:

 

I am posting again on this because I am getting frustrated beyond all
get-out trying to figure this one out.  Please, please put your thinking
helmets on before I take this one to a shop for diagnosis.

 

I start my car in the morning and drive with little to no idling.  The
symptoms are that when the car is cold and I get to a stop sign or red-light
the RPM will dip more or less dependent on ambient temperature.  On cold
days the engine will die.  I have replaced within the last 5K miles:  New
ISV (thanks Paul K. for the kind offer of your spare), new plugs, new plug
boots, fuel filter.  I pressure tested the intake with nothing plugged up to
about 15psi and get just a tiny leak at the MAF to turbo by the turbo.  VAG
only returns one code which is Adaptation Limit reached - or something like
that.  When the car is fully warmed up after 4 or 5 minutes of driving all
symptoms disappear.

 

This is soooo temperature related that I have to believe it has something to
do with a temperature sensor (MFTS replaced 15K miles ago; Oil temp sender
replaced 10K Miles ago) or perhaps my O2 "heater" is not working properly.

 

Any and all thoughts are hugely appreciated!!!!

 

Regards,

 

Mark

95.5 S6 - 88K miles