O2 sensors

[Johnny]

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The subject of calibrating output of sensors to fool the stock computer =
got beat to death about a month ago on the list.

It is possible to not have enough temp and that would account for the =
readings you are getting, but I think that your readings are probably =
due to the propane. Remember, the sensor is reporting O2, not anything =
else. It is calibrated to output a given voltage based on a range of O2 =
content that coincides with combustion properties for gasoline. You may =
just be off the scale when measuring O2 from combustion of propane. I =
wish I could help more on this, but I never got to the O2 sensor stage =
when I was experimenting with propane injection previous. You may want =
to try sticking the sensor in one of the primary tubes right up on that =
first bend where it gets hotter than hell just to see if you get the =
same readings... if you do then can probably assume that we are going to =
have to figure out how to compenstate for the false output. As far as =
confirming if the engine is indeed running that lean you can rev it up =
and hold it there, then just put your hand near the air horn of the carb =
and see if it speeds up. You could also try a heated sensor to see what =
you get. Meanwhile I will try to find something that gives a comparison =
on what the total exhaust contents are between gas and propane... might =
just be that propane puts of way less or more O2 when at stoich.

-j-


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From: 	dn[SMTP:dn at dlogtech.cuc.ab.ca]
Sent: 	Saturday, December 23, 1995 2:00 PM
To: 	Darrell Norquay
Subject: 	O2 sensors


Yo:

I need some info on oxygen sensors...  I have installed two O2 sensors
in my  header  collectors  (350  V8).    These are attached to two LED
bargraph meters for monitoring purposes  only  at  this  point.    The
readings  I  get  from the sensors are not really agreeing with what I
see from engine operation.

The  sensors show basically full lean (<100 mV) at almost all throttle
openings, which I cannot see because the engine runs fine, has lots of
power, etc.  The engine has 30000 mi  with  no  problems,  if  it  was
actually running this lean it would have eaten head gaskets or pistons
long before  now.    The  only time I really get a change in O2 sensor
output is under deceleration (throttle fully closed)  at  which  point
the bargraphs show full rich (>950 mV).


I'm wondering if it could be one of two problems:

1. the O2 sensor is not reaching full operating temperature because it
is in the header collector which is some  distance  from  the  exhaust
port...

With  regards  to  point  1, what is the advantage of the newer heated
oxygen sensors used on some systems? Is the heating  circuit  strictly
to  improve  response  time on startup and allow the EFI to run closed
loop sooner, or is it something different  altogether?    Would  using
heated O2 sensors correct this condition if this is the problem?

2. the  engine  is running on propane fuel, is it possible that the O2
sensor is not  responding  with  the  correct  reading  for  rich/lean
because of the different stoich point for propane...

With regards to this point, if this is the case,  is  it  possible  to
correct  the  O2  sensor  output  to  reflect the correct voltage with
alternative  fuels  such  as  propane?  Any info on how to calculate a
correction factor (if necessary) would be appreciated.

regards
dn


--
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<<<</\
\/ Darrell A. Norquay                   Internet: dn at dlogtech.cuc.ab.ca  =
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