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Poor Man's ECU Fuel Enrichment

In message <9712302059.AA16166@aztek-eng.com> DeWitt Harrison writes:

> Yes, you're right. And it may not be an accurate assumption.
> It has been my interpretation of what I've read here that
> at WOT, mixture control was accomplished primarily by
> the air sensor plate and fuel head with the ECU defaulting
> to open loop output settings. It's also my impression that
> the mixture frequency valve has a relatively limited
> range of control.

I'm trying to discover just what effect the mixture frequency valve has.  
Certainly the code steers some pretty extreme values into it at full boost and 
WOT.  What I need is a portable CO meter that we can attach to the vehicle in 
motion.  Then we can see what effect the frequency valve has.

 Phil Payne
 Committee Member, UK Audi [ur-]quattro Owners Club