ur-quattro misfire?

[Phil@sievers.com (Phil Payne)]

In message <970104105835_1558615383@emout14.mail.aol.com> QSHIPQ@aol.com writes:

> The fuel metering system rarely goes, assuming you run good gas thru
> it....

143k, don't forget.  Plus an unknown history before 66k.

>  Do the test on the fuel injectors, the system and control pressures
> first....

Done.  Control pressure was 5.6 bar against 3.4 bar nominal.  Replaced
the warm-up regulator and now have 3.4 bar.  Made a _huge_ difference
to general performance.

> Replace the injector seals as well, they go and creat all
> sorts of low bux solvable prollums....
> Also a new fuel filter sometimes helps as well...

All done 10k ago.

> That fuel metering system is expensive and is easy to ck with the
> system/control pressure stuff....  There is an outfit here that sells
> a bosch CIS compatable fuel system ck for about 70USD...  It's not
> as fancy as the bosch stuff, but for diagnostic is good as you
> need...

Yup, I know.  That's why I've been leaving it ever since Martin at
BR Motorsport formally "pointed the finger" at it back in August.

It's hard to check in flight - i.e., with the air mass sensor fully
deflected.  It doesn't miss when revving in neutral - only when it's
actually pulling a load.

I've checked the high voltage stuff today, and done some general
cleaning of connectors and grounds.  I don't directly suspect the
fuel system of causing this problem - it's too "on/off".  But I _do_
need to get around to the metering head.  Remember me asking months
ago if anyone had a spare hanging around?

I can afford to take the quattro off the road for a week or two - I
think I'll try my hand at renovating the metering head myself.

--
 Phil Payne

 Phone: +44 385302803  Fax: +44 1536723021  CIS: 100012,1660