[s-cars] Cold Start Issue ... Revisited

[Mark Rivera]

My urS4 still has a cold starting issue.  It always starts on the first try,
but when it's dead cold, it wants to die after the first few seconds, but
only after the A/C compressor kicks on.  If I quickly switch to manual
control on the HVAC to prevent the compressor from coming on, it idles and
runs perfectly.  I have removed and cleaned the ISV, but that didn't help.
I'm assuming the O2 sensor is fine since it only dies after the compressor
turns on.  Could it still be the ISV?  Is there some control that increases
idle when the compressor is activated that might not be working?  I remember
this phenomenon on some older watercooled VW's, and I think they had some
form of idle switch that activated when the A/C was turned on.

Thanks,
Mark