So i installed my Aem afr about a month ago and noticed some wacky readings, all over the place… running lean etc. I found a couple exhaust leaks which i addressed but it still did the same thing! eventually i sent the gauge and sensor back to aem, they checked them out and said the sensor was good but the gauges chip was messed up so they replaced it. i put it back in my car but same…old..thing. The car starts up normally with basic readings, but then it starts reading richer and richer until around 12 and then it goes full lean and stays like that. sometimes around normal driving ill see some numbers but under full boost it always shows lean. BTW my car only has a full turbo back, that is it. Help me evom community, you're my only hope.

 

How is the sensor mounted in the exhaust? Post a pic

 

9\3 O clock position towards the end of the down pipe, buschur racing made the exhaust and bung. il get a pic

 

Have you tried a clean air calibration?

 

Its an aem so you cant. Those widebands are not accurate. I would ditch it completely and get something better. The LC-2 works perfect for me with evoscan.

 

I'm just so confused, there is no way my car is running this lean. maybe a bad ground on the gauge?

 

Could be many things. If the wideband is wired up correctly, it could be a back injector not firing all the time, could be tune related, could be a whole list of things.

 

What did you use for ground and power?

 

the car runs just fine though, um ill have to check what power and ground I'm using… its around the center console and ebrake location

 

We believe your car is running fine.it could be simple wiring mistake.

 

I just changed to a butt connector cause my t-tap for my power wasn't really working. It's better now but the only thing is that under boost it still shows dashes

 

So I have a theory. When the exhaust/ sensor is cold in startup itll read okay. But after driving it on the street of under boost it doesn't read. So maybe when the sensor is hot it won't read? So maybe it is the sensor

 

I would by another wideband and try it.if it reads good then return the first one.

 

good news! i ended up replacing the sensor and we all good now

 

Which sensor? Wide band front or rear?.cause you mentioned aem checked the wide band sensor and said its fine. But anyway good to see you figured it out.