[Biturbos4] cold running operation on APB

Michael Benno mbenno at yahoo.com
Fri Dec 10 12:16:31 EST 2004

Thanks for the tips, I will look in the AW archives and possibly repost this message over there too since that list is pretty active.

Al Adler <adlere at sourcecodecorp.com> wrote:
I've heard that there is a ECU reflash that was a TSB that the dealers 
did in some cases. I don't have any details other than that. There might 
be more info in the archives or on Audiworld. FWIW, I have a 00 S4 tip 
that seems to run allright the one winter I had it; all the tips have an 
air pump that runs at cold start like you mentioned on the RS4. There is 
also a program called Lemmiwinks out there that allows you to change 
settings in the ECU; some use it to retune parameters for better cold 
starting primarily on stage 3 type engines.
Good luck,

Michael Benno wrote:

>I was hoping some of you more knowledgeable list members could shed some light on the cold running operation for the APB. I am looking to understand what components are involved what settings are modified etc to deal with initial cold startup and how colder air temps affect the system. 
>The systems I think are involved include adjustments are to enrichment, timing, and possibly limited boost pressure (not sure boost pressure is regulated on the bypass side or the WG side). I would expect the devices involved would be the coolant temp sender and MAF to determine how cold everything is and how much adjustments are needed. I would assume the ECU deals with enrichment, timing, possibly throttle plate compensation, possibly even boost control. But what other devices are involved and how does it all work.
>BTW, I noticed the R$4 has a system to feed additional air into the exhaust on cold running. This is to help the catalytic converters deal with enriched fuel mixture needed for cold running.
>Ultimately, I am looking to troubleshoot the cold running conditions in my car. I noticed cold running is getting worse with age. I am getting a kind of cutout on acceleration.
>Mike Benno
>'00 A6 2.7t 6spd MTM1
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