O2 Sensor Bias

[Walter Petermann]

Woosh...
never heard of that, but then I'm not familiar with GM. Ok, so
you're saying that if the ecm is tracking at a certain location
in this '18th block', which can be tweeked by biasing the O2,
then the ecm will remember this setting and use it as a 'base line'
to calculate fuel at WOT?  
Have you come up with a circuit to add the voltage to the 02? I can
give you a hand with it Sunday morning.

  Walter

PS If the car senses full throttle with a switch you could try
   disconnecting it.. just a thought.
 

Kurek, Larry wrote:
> 

>         >  Excuse the jumping in the middle of the thread again...
>         >  If the reading is 900mv at WOT then the ecm is either not
>         >  looking at the O2 or is already maxed out lean and can't lean
>         >  any more. Adding 50 or 100mv to the O2 reading won't help.
> 
>         No problemo!
> 
>         Actually, the way the PCM in the LT1 works (and most GM's for
> that matter), is that it goes open loop at WOT (actually, I think it is
> 40-50% throttle opening, but I could be wrong on the exact number).
> However, what it uses for fuel trim is the 18th block in the BLM, which
> is established as the max block prior to WOT operation. If I can force
> the ECM to trim the fuel leaner accross the board, then at WOT the fuel
> should be trimmed as well.
> 
>         TTYL!
> 
>         Larry