O2 sensor voltage output

[Mark Romans]

Hi Orrin,  I am using the tech1 snapshot,  it records the O2 voltage.  I put
together a spreadsheet and transcribed all the data.   I used to read a bit
over 800 mv at times but no more.  Maybe I will try a new 02 sensor.   Mark.
-----Original Message-----
From: Orin Eman <orin at wolfenet.com>
To: diy_efi at efi332.eng.ohio-state.edu <diy_efi at efi332.eng.ohio-state.edu>
Date: Wednesday, February 11, 1998 2:04 AM
Subject: Re: O2 sensor voltage output


>
>> Hello all:   I have been tuning my Vette for a while using a tech1 for
>> snapshot and trying to get the 02 sensor to at least 800mv at wot.   I
have
>> the MT program for my 87 Vette and I keep adding fuel trying to get the
02
>> sensor voltage higher up.  Lately it seems to want to go leaner.  700mv
>> range.  It isn't detonating,  I pulled timing out to try and eliminate
that
>> too.  I'm running a total of 31 deg now,  stock prom is 36 deg total.
Could
>> the 02 sensor be contaminated with high temp silicone from the exh
gaskets?
>> Do these things just get tired?  It still has the stock exh system so the
>> location of the 02 sensor hasn't changed.   Any suggestions/answers?
>
>How are you measuring the O2 voltage?  What are you using as a ground
>reference?  For a 1 or 3 wire sensor, the ground reference for the
>sensor is the manifold it is mounted in.  There can easily be
>0.1 to 0.2 V difference between the manifold and other grounds
>in the car...  So if you aren't using the manifold as your reference,
>you may well never get over 700mV.
>
>It is also possible that it got poisoned, but a new sensor would
>be an easy check.
>
>Orin.
>