Lambda heater

[Bruce Plecan]

There are two very different types of O2 sensors.
A Wide Band, and a switching style.
Most all oem manufacturers use the switching types.  Being a 3 wire, it
probably was economical, so I'd venture a guess that you bought a switching
style.
Switching means richer then  Stoic., is going to read greater then .44 and
leaner less then.
Trying to read more into it then that is just guessing

If you can monitor TPS openings, then try to tune for the smallest opening
per a given road speed, generally you'll get best mileage there.  Be advised
when doing the timing changes in this area, it takes the engine 10-15 to
restabilize temp wise.

Being an altern fuel things may vary.
This is all just from what I've seen, and is given just as a aid to project,
your results may vary
Bruce




> Excuse me if this query is a FAQ, if so would someone point me at a
> suitable information resource. I have lurked here a little while and
> admit most of the discussion is technically beyond me.
> I wish to monitor the exhaust of a vehicle that has been converted to
> run on LPG (propane). The fuel is a by product of natural gas
> transmission as well as from refineries and is lightly taxed for road
> use here in  UK, as it is clean burning, though of only 75% of the
> calorific value of gasoline.
> The gas mixture control appears rather basic so I want to monitor it,
> the carburetted engine is way under stressed so damage is unlikely but
> I would like to optimise fuel consumption.
> I have purchased an aftermarket 3 wire sensor. Two wires are for the
> heater circuit and the third the signal with ground through the body.
> I chose a heated sensor as I wish to mount it fairly well down the
> exhaust.
> With that premise I have a number of worries.
> 1) from the UEGO thread it seems possible that the heater will not
> take 12v without some thermal shock? If so what should I drop the
> heater voltage to. As the exhaust will have cooled further down the
> system I take it the heater must maintain the temperature at about
> 300C?
> 2)I am guessing the lambda sensor is effectively two oxygen zirconium
> cells back to back, the voltage generated from the ambient air side
> acts in opposition to that generated from the exhaust oxygen?
> 3) Is the thread standard on these things? mine appears to be 18mm by
> 1.5mm pitch, is marked "Japan 5350 03B13".
> AJH

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