[Biturbos4] Rough running when cold

David Bray brayd at rogers.com
Wed Mar 24 14:07:29 EST 2004

Hey Russ,

My 2001 S4 6 spd has done this since new and a number of listers have
reported similar problems.

The following was done to mine, to the point that now, it's driveable (not
PERFECT, but I can live with it).  I (subjectively) noticed some incremental
improvement after each of these:
- changed MAF
- changed charcoal canister
- changed coolant temp sensor (no noticeable improvement, on this change,
  but dealer said Audi had a TSB on it)
- changed to Mobil 1 0w30 (from dino juice)

Keman on this list (an Audi tech in the USA), said that some adjustment to
cold engine fuel maps was the answer, but due to excessive emissions, it
wasn't condoned by AoA.  He was going to look into the exact values, but to
date, I haven't seen this published.


> -----Original Message-----
> From: biturbos4-bounces at www.audifans.com
> [mailto:biturbos4-bounces at www.audifans.com]On Behalf Of Russell Romano
> Sent: March 23, 2004 10:21 AM
> To: biturbos4 at audifans.com
> Subject: [Biturbos4] Rough running when cold
> My '00 A6 2.7T runs REALLY bad when it is cold out for the first 1/4 mile.
> I try to let it warm up for a couple of minutes, but sometimes
> that isn't really an option.  This morning, it was about 28
> degrees at my house, and I started my car and rolled down hill
> out of my drive way.  The car would barely respond to throttle at
> all and was quite hesitant to rev up (manual trans) enough for me
> to start moving.  It bucked and hesitated a little bit... but
> after about 1/4 mile it was running pretty normal and it was
> perfect after 1/2 mile.
> I vaguely remember talk about a software upgrade to correct this
> condition.  Does anyone have any details?
> -Russ
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