Mixture setting

[Jesse+ Clendenning]

On Fri, 06 Apr 2001 13:27:03 -0700, one at humanspeakers.com wrote:

>  bad O2 sensor?  try measuring its output.
>  
>  Jesse+ Clendenning wrote:
>  > 
>  > Thanks folks, this is my first post. I have had several Audi's and am
having
>  > a problem that confounds me. This car is an '86 5000tq - single knock
sensor
>  > MC (as you already know). The trouble I am having is setting the
mixture
>  > using the my Sunpro. I have done this on several other cars I've owned
and
>  > others. My trouble is the duty cycle at idle stays at 5% no matter
which
>  > direction or how far I turn the 3mm allen. Now if I rev the engine and
check
>  > at different RPM settings, the duty cycle increases. @3k rpm it reads
~50%
>  > duty cycle. Even higher RPM's yeild me even higher duty cycles. If I
unplug
>  > the O2 sensor I get 50% like I should. It's been confounding me for
some
>  > time. This car is a recent aquisition and I have redone the head and
checked
>  > everything for vacuum leaks. I mean everything. Boost is good, but who
wants
>  > to be riding at 1.8Bar without a stable mixture... NOT me. Thank you
for the
>  > help you can yeild. I have searched the archives and cannot find
anything
>  > quite like this.
>  > 
>  > Thanks guys and I hope to be a contributing member to the list from now
on.
>  > 
>  > _______________________________________________________
Thanks guys for your responses and help. I have found the culprit to this
problem. Usually I do not get as stumped as this. Fuel
Distributor/injectors. #'s 4 and 5 will squirt constantly as long as there
is fuel pressure. Thier volume will not increase with a corresponding
increase in air flow. 
I did neglect to mention that this particular car was a recent aquisition
and so I did not have much history on it. Thanks for your help and I am
always here, watching and posting.






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