[s-cars] ARGH!! Stalling at idle

[Mark Strangways]

the colder it is, the more fuel you need
a- FPR is fucked.
b- MAF has a temp sensor built it.
c- any intake leaks exaggerate the improper fuel ratio when cold.

Mark
----- Original Message ----- 
From: "Mark Pollan" <mark.pollan at mci.com>
To: <s-car-list at audifans.com>
Sent: Thursday, February 10, 2005 10:24 AM
Subject: RE: [s-cars] ARGH!! Stalling at idle


Everything I heard so far makes sense but I'm stuck on the ambient/engine
temperature thing.  The lower the ambient the more pronounced the idle dips
when the engine is cold.  Once the engine warms regardless of ambient all is
well.  What gives??!!  I can't afford to scratch my head much more as I'm
already down to the scalp - doh!

Mark

-----Original Message-----
From: Mark Strangways [mailto:Strangconst at rogers.com]
Sent: Thursday, February 10, 2005 10:08 AM
To: Mark Pollan; s-car-list at audifans.com
Subject: Re: [s-cars] ARGH!! Stalling at idle

Check your Fuel Pressure, replace the MAF with a good known one.
Finally swap out injectors with good known ones.

I had similar issues and it was an intake leak around the MAF to Turbo hose.

Mark
----- Original Message ----- 
From: "Mark Pollan" <mark.pollan at mci.com>
To: <s-car-list at audifans.com>
Sent: Thursday, February 10, 2005 9:32 AM
Subject: [s-cars] ARGH!! Stalling at idle


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

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