I have a ’98 Disco and have added a HHO generator to increase mileage. I have replaced the four O2 sensors with variable resistors. I would like to know exactly what voltage will keep the computer happy. I now have the outputs set at 32 ma for both front and rear. The check eng light is still on. What voltage is the computer looking for to make it see a good O2 reading from the sensors?
Hho
- Thread starter skyhero
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The rears I know have to fluctuate, not sure about the fronts off the top of my head
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Here is what I got from a quick google search... and yes all O2 Sensors act pretty much the same.
http://mr2.com/TEXT/O2_Sensor.html
http://www.aa1car.com/library/o2sensor.htm
http://www.kemparts.com/TechTalk/tt07.asp
http://mr2.com/TEXT/O2_Sensor.html
http://www.aa1car.com/library/o2sensor.htm
http://www.kemparts.com/TechTalk/tt07.asp
Thanks again Joey - I have removed all four sensors, installed four 20K wire wound pots and adjusted the pots running and warm to around 30 ma, or 03 volts. You say that the ECU is looking for 'pulses', but the titania sensor is just a variable resistor: it does not generate voltage as the zarc sensors do - and that's what has me confused. It still runs as if in open loop or 'bad sensor' mode. Is it possible that the ECU may want to see a subtle change in voltage each time it checks? I'll keep on experimenting. A screen shot of a scope trace from a good system would be great. Still 'googleing' with little luck. I'll get it sooner or later, but don't want to blow the ECU in the process! 
wolf
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If you want a definitive answer to this you need to talk to the number one Land Rover GEMS guru in the world (bar none) and that is Mark Adams of Tornado Systems in the UK; not to put too fine a point on it but he cane make a LAND ROVER ECU play chess and mix your martinis for you too (LoL).
Wolf
PS - I looked long and hard at the HHO system for my engine and I was not happy with a number of things that I thought would flip the old girl's ecu sideways and, not least of them, was that reading from the O2's. Remember, the LR ECU is not your normal vehicle computer - or should I say intelligent relay box - as it is an actual self-monitoring double-chip system - that tamps down ******* any and all attempts to fool it. If you wil, it has a fail-safe chip that constantly monitors the main chip which curbs the primary chip from any random acts of good fuel economy (LoL). The reason for this is quite sound as LR marketted these machines into every third world back water you can imagine and in order to keep them running (not necessarily well - but running) they had to keep the ECU operating within some very firm parameters. Fuel quality (or lack of it) was a primary concern as they wanted to avoid damaging back or missfires at all costs - so fueling arameters were enormously robust and tamper-proof.
Wolf
PS - I looked long and hard at the HHO system for my engine and I was not happy with a number of things that I thought would flip the old girl's ecu sideways and, not least of them, was that reading from the O2's. Remember, the LR ECU is not your normal vehicle computer - or should I say intelligent relay box - as it is an actual self-monitoring double-chip system - that tamps down ******* any and all attempts to fool it. If you wil, it has a fail-safe chip that constantly monitors the main chip which curbs the primary chip from any random acts of good fuel economy (LoL). The reason for this is quite sound as LR marketted these machines into every third world back water you can imagine and in order to keep them running (not necessarily well - but running) they had to keep the ECU operating within some very firm parameters. Fuel quality (or lack of it) was a primary concern as they wanted to avoid damaging back or missfires at all costs - so fueling arameters were enormously robust and tamper-proof.
