[s-cars] ARGH!! Stalling at idle

[Steve Eiche]

Have you tested the temperature sensor at the back of the head (white connector)?  That is the sensor that the engine ECU uses to determine engine temp, not the MFTS.

Steve Eiche


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!!!!