so can i buy just the sensor

so if i can get a better fuelmap and turn off corrections, in theory it should stop doing it

yes. that's the theory and how i'd test it out before listening to some braineack.

Like Braineack said earlier, if your O2 sensor is reading poorly it'll screw up your MS, regardless of a good fuel map. The LC-1 can be replaced with a Bosch part that I believe costs $60. Do a search on google, you can find the Bosch part number and just head down to autozone.

yea did all that yesterday bosch #17014, thanks for all the info. still need to test it out today

Just something i'd like to throw out there. If you have any exhaust leaks pre O2 sensor your sensor will read lean. You may even have leaks you cant hear.

^^^that too.

sicklyscott, I actually if he turns ego off it wont use the o2 reading at all. I was suggesting that if his o2 was bad and giving bad reading and he richened the fuel map constantly more and more after each tune, and then once the car got hot and the AIT enrichments dumped in even more fuel it would run like crap.

My lc-1 failed this way, i kept making my tune richer and richer and richer because my sensor was on it's way out and giving me false readings.

This is how rich it got...I couldn't even finish the dyno pull:

http://www.boostedmiata.com/gallery2...ch_as_crap.jpg


I had to tune out the fuel by hand going off the dyno's WB after each pull, here's the progression:

http://www.boostedmiata.com/gallery2...movingfuel.jpg

My wideband started showing very lean too the last time I was driving the car. I did have an exhaust leak though so i'm hoping that was the problem. It was showing so lean that I could idle the car at 17.5 afr and it wouldn't have any issues. It used to get iffy when I got above 14.5.

then that's a leak...that's easy.

I was agreeing with you, I had the same issue which turned out to be a bad sensor, had nothing to do with MS at all until I tried to tune it out which was a bad idea.

Surprised no one mentioned WB calibration as a possible culprit.
--Alex

so with the new snesor things seem to be better so far, i have encountered what i believe is Lack of corrections for AIT bc i only saw a problem when i stopped to check out my ve table #'s and my AIT hit in the 130+ and it went super lean at idle, i shut it off then turned it on and it idled fine even though the AIT were still way up there. Im working on a new table. Any suggestions on ve values or AIT corrections, or well any suggestions welcome... i need to get this car done

Ok i was driving around with ego off and accel off and it is still slowly leaning out over time and if i turn off the car and turn it back on its fine for a little while

this is a datalog of when it leans on idle

this is the new table ,under construction, for these datalogs

this is after the first datalog i turned the car off then back on

I noticed the gauges on my computer werent showing correct readings but the cars gauges were ok. it held at a specific map and/or rpm, first time its ever done this, it happened in tunerstudio

which gauges? mat and clt?

all of the gauges went wierd my rpm stayed below 2000 and went down when i accelled my clt said like 80 after it had just said 190+ my map went to 100kpa first then cam down and stuck at like 40kpa my ae pct started pegging my afr stuck lean it was all messed up but it didnt change how the car was running at the time

I think that was just a glitch with ts or something. But it still leans over time