O2 Sensor Bias

[mrvette]

No,  the computer is looking for a conversation between it and the O2
sensor....it has to swing back and forth from .1 to .9 volt....or the computer
says something is wrong.....GENE

Kurek, Larry wrote:
> 
> Guys:
> 
> I've been doing some thinking/analysis (scary) on the recent posts I
> have had concerning the variability in the different PCM's I have
> installed in my 94 Z28 (LT1).
> 
> Got a good question for you...
> 
> A lot of guys play with fuel pressure to alter their WOT O2 readings. I
> understand that GM runs the stock motors a bit rich, and a lot of guys
> lean them out to get more power. So, if the purpose of lowering your
> fuel pressure (which affects the atomization of the fuel injected), is
> the way to get lower O2 readings, doesn't this affect overall
> drivability?
> 
> Second, in the factory Helms manual, it states that the PCM applies a
> reference 450mv to the O2 sensors, and then reads the voltage variance
> from this point to determine the fuel ratio. If this is the case,
> shouldn't it be possible to just place a resistor inline with the O2
> sensor to "trick" the PCM that the O2 sensor is reading a higher voltage
> than it really is, and thereby lean the mixture accordingly? Maybe I'm
> barking up the wrong tree here...but is this possible? How? Any
> problems?
> 
> TTYL!
> 
> Larry

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