civic vx 02 sensor UPDATE and lean burn monitor ?

[Mpgian]

A8 on my ecu is not leanburn or I haven't gotten into leanburn yet... But it only lights up when I start the car...

[steffen707]

Originally Posted by steffen707

So i clicked on this link and it takes me to a $200 O2 sensor. Where is this $77 one you speak of?

Anybody found this $77 o2 sensor? I'm only seeing the $200 one.....

[hxman]

I am also interested in a cheaper alternative to the $200 sensor. I don't have a check engine light or a code but I suspect that my o2 sensor is lazy. I keep getting 29 - 35 mpg depending on city/hwy mixture. I wish there was a place I could buy this sensor for less.
Please let me know if anyone has a solution to this...
Thanks

[brucepick]

Ahhh, the phantom Lean Burn LED.

If anyone has the recipe for this I'm interested. Can you get the input signal from the Oxy sensor itself?? I'm actually more comfortable tapping into a wire under the hood than I am hacking into the connectors at the computer .

[KnightmareCS]

I don't see why this so hard. You already can tell if you're in lean burn by monitoring whatever voltage to see if it goes positive. Why can't you use the same pins and run a wire from them to a circuit which relays a LED when the voltage is positive or whatever range? You can use a pot to fine tune the lean burn range light up. I'll ask my friend what he would suggest, but it seems like a straightforward doing.

[KnightmareCS]

Post 6

www DOT gassavers DOT org/showthread.php?t=12156

www DOT autospeed DOT co DOT nz/cms/A_1716/article.html?popularArticle

closed loop monitor
I built this and it works great. You can change the comparator to light for closed loop or open loop. I have two green LEDs on the dash one lights for injectors off and they both light for lean burn.

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The closed loop monitor uses a comparator curcuit. You set a voltage and you can wire it to light above or below that voltage. Injectors off is a certain voltage(I forget what it was) so I made two curcuits one is set to monitor lean burn the other monitors the injectors.
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Exactly what I said to do.

[SIGNAL AUTO]

Any know were to get the o2 sensor for cheaper that 200?

[Ozolins]

I suspect my O2 sensor... slight hesitation, apparently no lean-burn (by looking at the MPGuino there is no jump). When I unplug the O2 sensor, hesitation goes away.

So, I'm about to solder in some wires so I can easily check the voltage and monitor the O2 sensor/lean-burn. From this thread I can see what I *should* be seeing, but what would you expect to see if the sensor is bad? Is there any clear indication?

Also, I've been wondering, is lean-burn a binary situation? on/off? or is it an incremental adjustment in amount of fuel made by the ecu in response to the o2 sensor signal? That pertains to whether an idiot light would be meaningful.

I'm probably going to wire in one of these: www{dot}adafruit{dot}com/products/705
and add on a vtec led somewhere.