RE: '98 A6 2.8 won't start- mechanics are at a loss...

[quk@isham-research.demon.co.uk (Phil Payne)]

In message <B5F039C6D4BBD211836B0090273F47290126AF6D@carrera2> "Dupree, Jim" writes:

> Spirited driving would help keep the temperature up.
> Or maybe a turbo, that's it Audi should retrofit a turbo to all 30Valve V6's
> free of charge, to keep the carbon build up down.

I've never heard of carbon build-up in a properly set up Audi engine.

Supposing the phenomenon to exist, however, I find it vanishingly
unlikely that all five cylinders would simultaneously be affected by
lumps of carbon holding the valves open.  And even less likely that the
car would pass any kind of compression or leakdown test in this state.

Tom related a story about a car suddenly stopping on the highway and
passing compression tests.  I suspect, in fact, that it actually passed
_leakdown_ tests.  The key clue is the high engine revs on the starter.

The condition is documented in the 20V (RR) manuals and the primary
cause is given as incorrect assembly of the oil pressure relief valve.
Obviously this isn't the cause if it happens out on the street - you
have to postulate some other reason for relief valve failure, like a
piece of crud or a broken spring.

Anyway, Tom hasn't yet commented on today's findings.

--
 Phil Payne
 UK Audi quattro Owners Club
 Phone: 0385 302803   Fax: 0870 0883933