weird o2 sensor readings? (mc'd urq)

[Michael S. Williams]

At 1:56 AM -0400 7/7/03, Huw Powell wrote:
>>ok... i figured, though, that it wouldnt be jumping from 0-1 volt
>>constantly, but within a smaller range...  otherwise those a/f gauges
>>would be going from blank to fully lit constantly...
>>
>>iwas under the impression that the voltage signal would start to
>>stabilize a bit under load, hence the desire to have a .9-.95 volt
>>reading...
>
>absolutely not, this is a feedback loop that is constantly
>correcting itself by over-running *very slightly* in each direction.

ok, thanks for clarifying...

>
>>>and finally, when i turned off the car, the voltage reading
>>>>  stayed there, and was around .550v
>
>that is just a voltage that appears on the ECU.

ok. i thought so, but wasn't sure.

>
>>i understand it fluctuates, but i was also under the impression that
>>the fluctuation was within a sub-range of the 0-1 volt reading, which
>>is where stoich is
>
>anywhere between .2 and .8 or so volts on an OXS *is* stoich.  They
>are a very fine tuned device.  slightly rich or slightly lean,
>meaningfully, that is, is off-scale.

hmm... ok...

>
>>trust me, i tried that.  i set it to be 'exactly' within specs of the
>>bently at 50%  dc +-8%.  it had no power above 3k rpm. then i
>>listened to listers advice that i had in the archive and set it at
>>35-40% for a richer mixture.
>
>Richer at WOT and cold - still close to stoich in closed loop.
>
>>  that helped a little, but not very
>>much.  then i tried 20%, again, helped more, but not very much.  now
>>it is somewhere around 4% pegged, because the frequency valve doesnt
>>even turn on at idle it is so rich, and FINALLY im gettinga little
>>bit of power...
>>
>>so there's something going on in there that i havent found yet...
>
>Yes, something else is really broken.  I would follow the listers
>advice who suggested a "new" (used) fuel distributor - try to swap
>in some other parts to see what effect they have.  Do you have
>access to a field full of junked cars that ran when they died?

actually, i was just sent another fuel metering head, an actual MC
metering head, along with fuel lines, injectors, and press.
regulator.   it's been sitting in the garage for a week or so...

i dont have one of hte gaskets that goes between the airbox and the
metering head stuff, unfortunately, so i dont think i can/should
switch it.

what about switching JUST the metering head (that the lines attach
to), and the lines/injectors?  i was told that the car they came off
of ran well...

right now, it is the original UrQ metering head mated to the MC electronics...
--
MswmSwmsW

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