Re: New Audi A6 2.7T 6 speed in the garage

[<isham-research.freeserve.co.uk@pop.pol.net.uk>]

> When I used to do instrumentation and electronic consulting for Toyota
> Racing Development, I heard plenty of (old wives?) tales about people
> that decided to cut off fuel when the engine was braking and paid for it
> with burned pistons.

Happens on the MB engine.  Part of the high output enrichment comes from
a fuel frequency valve input.  Close the throttle at full chat and the
engine goes lean _very_ suddenly.  If the ECU is badly chipped (voltage
divider vs proper reprogramming) the engine can go lean and hot enough
to burn a hole (usually in #5, sometimes #4) or shatter the exhaust
manifold.

Not an old wives' tale.  Too many holes in too many pistons.

--
 Phil Payne
 UK Audi quattro Owners Club
 Phone +44 7785 302803  Fax +44 870 0883933