O2 Sensor problems

Chrisfol82 · Post by **Chrisfol82** » Fri Jul 28, 2006 5:23 pm

I dont seem to be getting the right reading in MT from my O2 sensor.

I just got a new wideband O2 sensor and hooked it up. I was showing around 0.4V in MT.

I was getting this same problem before when i had my narrow band O2 sensor.

I have MSII V3.0. I did the calibrate AFR table in the tools menu, and selcted wideband in the EGO settings.

If i hook up my stimluator i get readings varying from .41 to .51 V. Shouldnt this be a bigger range with the stimulator?

Chrisfol82 · Post by **Chrisfol82** » Fri Jul 28, 2006 6:34 pm

Ok i did what lance suggested in an earlier post, ive been gone for a few weeks for work and i forgot about that post, setting the AFR calibrator to DIY WB, then turning it off and back on then setting it back to narrow band. This gets me a good reading with my stimulator from 0 to 1 volts.

When i switch to Innovative LC1 0-5 and do the calibrate AFR table i get .41 to .51 volts from the stimulator. I woudl think i shoudl still get 0-1 volts from the stimulator even with wideband selscted.
I also set the EGO control to single wideband.

Do i have to do anythign else to get the wideband to work? i read somewhere sayign that i need to set the configutor to wideband too, how do i do this?

Bernard Fife · Post by **Bernard Fife** » Fri Jul 28, 2006 6:40 pm

Chrisfol82,

You have to do one more thing: go to the Configurator ('File/Configurator' in MegaTune), and under 'Settings.ini/settings' set the LAMBDA_SENSOR to your WB type.

MS-II doesn't report the voltage when a WB is selected, uinstead it reports the AFR directly.

Lance.

Chrisfol82 · Post by **Chrisfol82** » Sat Jul 29, 2006 5:00 pm

Well i was trying my wideband O2 sensor again today and it seems like its not working now. The computer wont even acknowledge it and if i try to go through the recalibration sequence i dont get any blinking from the LED like i did the first time.

So i decided id just put my narrowband back in and run that to see how it woudl run. Now it wont start at all. All it does is crank. I have all my settings right for the narrowband again and im using the same file that i used two weeks ago when it ran.

When it ran before though sometimes it would run good for a while then if id start it up again later it woudl run really rough and wouldnt even idle without giving it a bunch of gas.

I havent changed anythign since then and i cant figure out why before it woudl start to run rough and now it wont even start.

Chrisfol82 · Post by **Chrisfol82** » Sat Jul 29, 2006 5:05 pm

Oh and one other thing that has been happening that is wierd is after i crank it for a little while sometimes the fuel pump will stay on. I have to turn the key off and back on to get it to go off.

I was gonna try to attach a log of it cranking but i dont see how to attach a file, i must just be missing something here cause i knwo ive posted logs before.