So recently my aristo gte swap has been acting really strange, my wideband reading appears to be hunting around 12-13 on some days and at other times it is around 16. I think it is a bad o2 because it refuses to drop below 14 at wot and unless my manifold pressure is less than 0 my afr is all over the place. If o2 is to blame I was just going to wire my wideband into the stock o2 spot on ecu and relocate to that location too. That's all I have got, but I am open for anything that helps. I'm using the innovate lc1 by the way.

 

Need more info, ecu type, injectors singleturbo etc.etc?

But I will say if the 02 was bad you would reflect rich if on a stock ecu.

NEED MORE INFO

 

Stock ecu, although I did have map ecu hooked up for a week, 440cc injectors and a single t66 turbo

 

How much boost?

 

Set at about 10psi, but I don't like to go wot because it just sits at about 14-1, it's really strange because when I started it all last week I had to give bad during the crank to keep it from sputtering to a stop, but now I have to problems, that could just do with the high heat and humidity south Carolina experienced last week. It just seems that everything is so inconsistent it must be o2.

 

Sorry auto correct on my phone I mean to write that I have to give it gas during the initial crank.

 

What is your idle afr at first start up with wide band?
Approx cruise afr auto or stick?
bone stock fuel, any mods at all to fuel?
How are you controlling boost?
FMIC?
Why did you remove MAP ECU?

 

Where is the wideband sensor located?

 

Sometimes idle afr is @13, other times it is @ 16, that's what is confusing it's not consistently on one side or the other, it cruises fine at about 14-14.5, auto transmission. Upgraded to a Denso 285 lph fuel pump and has the 12v mod. Boost is controlled manually with a bleed type controller. I removed Map ecu because I haven't had time to fine tune it, and it is my daily driver, so I couldn't deal with the base tune running rich at 10-1 at idle and cruise. Wideband is about 36" from the exhaust of turbine housing while narrowband o2 is about 8" from exhaust. Thank you for your help so far!

 

Are you sure the wideband is good? Can you hook up a friends sensor or put it on a dyno with a tailpipe sniffer to test it? It's odd that the problem seems to be intermittent.

 

I can't be sure, but I hope the wideband is good, it's only two months old. I would like to relocate it to a better spot though, because I am worried about condensation damage to the sensor.

 

$75 later it is not o2. I just replaced my o2 with a new Bosch. Everything seems alright, but it will not drop below 14 @ wot. I just don't know, before I had map ecu 3 on it it would drop to 11.7 @ wot, then I put it on, did some tuning, decided to postpone tuning till later, disconnected the piggyback and now it's doing this, it seems like it is running on a stock tt tune now, but why did it run so well before???

 

Told you it was not the 02 sensor would go rich not lean stock ecu is programmed to save the motor and would send the car rich, typically a bad wideband will read a constant 14.9 but try a different sensor just to omit this from your search.

 

I was thinking wideband but that doesn't explain why it ran so poorly, the wideband isn't connected to anything it is just for monitoring. I mean the car seems to be running fine now though, so I'm not sure. It just pisses me off because I just bought the wideband 2 months ago

 

I have been told it can be a bad fuel filter, do you agree?