it is supoosed to be 1 volt to 14.7AFratio... but i made one but since i got the 3wire type... its not working... i migth swap in the other one .... 1 wire...... good luck !!
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Crazy !
Sentra Sport Coupe 87 Turbo
14.850@97.454mph
H&R Spring, 15psi, TMIC, 370cc, Nismo mount and pulley, Almasi tuned ecu...
Anything over 1 volt shouldn't appear on a standard O2 sensor (earlier info I posted was incorrect on that). By 1 volt on a narrow band sensor, you're way rich (somewhere around 10:1). Stoich 14.7 covers a pretty wide voltage range (this is the problem with narrow band sensors) from around .2 to .8 volts. The difference between a 1 wire and a 3 or 4 wire sensor is just self heating ability. As long as they're both fully warmed up, the readings will be the same. However, at cold startup, long idling, or low load cruising, the 1 wire can be too cool to give accurate readings.
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84 Ford Bronco II 2.8
86 Ford Bronco II 2.9
86 Nissan Pulsar w/ Weber and CA distributor (gone, but not forgotten)
Last edited by fastpakr : Mar 6th, 2003 at 01:48 PM.
Why it didn't work? Now I am confused! Somebody told me that E16s' O2 sensor doesn't produce voltage, he told me that the sensor uses like thermal sensitive resistor, which reacts to oxygen ions. In this way it varies the internal resistance of the sensor which being read by the ECU. Can somebody here confirm this.
If this is true, the circuit that I am going to build surely is not going to work.
By the way I need the max. voltage range value, so that I could program the O2 meter to be exact.
The O2 sensor will produce voltage, it requires no voltage input. I'm not sure if you've seen a graph of voltage output on a NB sensor, but it doesn't vary directly with A/F ratio. Basically, the voltage reading can only effectively indicate lean or rich, but not actual ratio. Look at this: (thanks to the Megasquirt site for the picture)
There are sensors in existence that are capable of accurate A/F measurement (known as wide band sensors, they have a 5 wire harness), but are extremely expensive. Honda used them in some of their vehicles and controls the licensing on producing them. I believe they run upwards of $300 new if you can find them.
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84 Ford Bronco II 2.8
86 Ford Bronco II 2.9
86 Nissan Pulsar w/ Weber and CA distributor (gone, but not forgotten)
Last edited by fastpakr : Mar 6th, 2003 at 05:25 PM.
Hi Guys! Allow me to add my 2-cents worth here:
fastpakr is absolutely on the money regarding the narrow band sensors: they actually do generate a voltage. This voltage is actually caused by the difference in oxygen levels between the exhaust and the atmosphere, and, in reality is the result in the difference in Oxygen ions between the two sides of the sensor. The greater the difference in O2 levels (i.e. the richer the exhaust mixture) the higher the voltage.
These O2 sensors have ports on the outside, allowing them to sense the level of ambient O2. If these are clogged (for example by spraying silicon spray around the sensor area), it will kill the sensor. Additionally, the engine and exhaust need to be properly grounded in order to get the proper voltage readings. Excessive voltage drop across the engine ground (most likely when the alternator is under high load) will cause the readings to go out of normal range.
Many systems of this type will go to a mid-range value for the mixture control if the O2 sensor is disconnected (not sure about the Nissans). If this is the case and everything is functioning properly, you should probably see a reading of 0.450 V at idle with the sensor disconnected. Unmetered intake air leaks, ignition misfire, and exhaust leaks would be a reason why this reading might be lower. Excessive fuel entering the intake would be an explanation for too high a reading.
according to the Haynes Manual the typical is from approx. 0.100 volt to 0.900 volt but it didn't specify which engine, I guess all the engines in the manual use the same range.
(thanks to the 
Linear Mode
