B5 S4 No start

[john at westcoastgarage.net]

You said:  "Thought I'd throw it out there to see if anyone has any BTDT on 
the
> modern
> Audis.
>
> This car has a shady history- front end wreck, purchased by local kid
......................snip.....................................
> Noticeable is that MAF g/s show as "0" while cranking.  IDK if this is
> "normal" or not.  I don't think I've ever cranked a newer Audi more
> than a
> few seconds.
>
> So I have to do the "back to basics" approach (spark, fuel, air) to
> diagnose, but I suspect I'll find some faulty wiring (since the car has
> shady history and major work done in the past).
>
> Any BTDT?  Good ideas?  What gets me is no codes at all.
>
> Thanks!
> Mark Rosenkrantz

A big vacuum leak comes to mind.  If the MAF isn't passing any air, it ain't 
gonna give you a reading.  John