kyoo

iTrader: (29)

Hope someone can help me out. The wideband is an Autometer that was recently installed (but I've had on my old Evo for 4-5+ years) - installed from one car to another, and working perfectly before that. The o2 sensor itself is less than a year old. It seems to be reading right at the gauge, though I am running lean during cruise (15.4+).

While taking logs to tune the car, the wideband reading you get from Evoscan seems to be incorrect. I've tuned through this method for about 6 years now, and this has never happened before. So while the wideband reading at the gauge will bounce all around as usual, the wideband reading in evoscan sits at 10.0588235294118, 10.0294117647059, etc., or 10 flat and just sits there for extended periods of time.

FYI, the formula I have in Evoscan reads 10.00+(16.00-10.00)*x/204 , which is what I've had my wideband formula at for at least 4 years. Even if the formula were wrong, the evoscan read of the wideband shouldn't just sit at solid values for extended periods of time. Thoughts?

kyoo

iTrader: (29)

bump

lancerrally45

iTrader: (22)

Is the wiring coming loose at all at the ecu?

kyoo

iTrader: (29)

not that i know of - are you thinking it's mechanical/electrical?

kyoo

iTrader: (29)

anyone have this issue before?

kyoo

iTrader: (29)

ttt

uicsux

iTrader: (2)

how are you connected to the wideband? via the ecu pin or usb serial?

kyoo

iTrader: (29)

checking with shop - i guess saying that "i use the tactrix cable" doesn't help here

Wicked_X

Did you find a solution kyoo? I'm having same issue with my AEM UEGO. Reads from 9.5, to like 10.9. Used to work fine, but I dont have the exact formula I used before. Right now its 0.03913*x+9.5

Fox_IX

I often run into this issue when the ground(s) for the wideband are separate from the ECU grounds. You get a voltage offset between the wideband and ECU. If possible, wire wideband ground to a sensor ground or if not possible, to another ECU ground wire. Most of the time I've had the wideband read different than what the ECU was displaying, this was the case.

Wicked_X

I'll have to try different grounds. My boost gauge, wideband and serial cable are a grounded to same location under the steering column. It worked great before, that's what has me stumped!

Fox_IX

Try running the wideband signal ground to an ECU signal ground.

kyoo

iTrader: (29)

for me it was a formula difference but the formula depends on your wideband

carbon_toast

Doesn't the AEM use a serial output to report AFR to evoscan? That means there should be no formula for an AEM, since evoscan should just use the value its getting from the serial connection directly.

I check the "External Wideband A/F Ratio" display item in evoscan to show AFR for the AEM, which works for me, maybe try that.

Wicked_X

Interesting, will try that and report back.