Please anyone who can help I would greatly appreciate it. Well I have a AEM UEGO wideband gauge, and it has just started to read very rich at wot in every gear. I'm talking about 10 even is wear it goes flat. The car is running very good, it pulls hard in every gear. I don't think that it is running rich, I do not have any black smoke or anything like that. I was thinking it might be my wideband o2 sensor going bad. I was thinking about running a test on it that has been posted on youtube to find out if that is my problem. I was told from a rep at AEM that when the sensor goes bad it usually will read out all the way lean, but that I should still test it. Please any other thoughts would shurly help.

 

It might be a bad O2 sensor. How many miles have you put on it?

Have you checked your plugs? Doing some WOT runs and then pulling the plugs will give you a good idea if you're right or not.

 

Probably 18,000 miles or so. The plugs looked ok, I already pulled them.

 

Your afr readings are fine during low loads though?

 

How is cruise? Idle? You could have a boost leak.

 

I just got my AEM UEGO installed after a tune and it started doing the same thing. I got my tune touched up a few weeks later as the tuner said it was probably due to it being very cold the first time I was tuned. From there it no longer read 10; it was closer to 11 never getting below 10.6. Idle is between 14 & 15. I don't drive my car much so I'll have to watch it to see how it goes now that it's warming up even more. I wouldn't think a tune would be that touchy where I may need a winter and a summer tune.

 

Try doing this test:

http://www.youtube.com/watch?v=1mb4VmDd0ao

Also when were you tuned? Depending how rich you were originally tuned, icrnk might be on to something.

 

idle afr is between 13.9and 14.6. It idles just fine, purrs like a kitten

 

It has been 3 years since my tune!

 

That video should be a sticky. Great info. I didn't know you could check it that way. Thanks.

 

i have seen so many threads about this and more often than not you just need to clean out your wideband sensor with compressed air and recalibrate.
unfortunately they always read rich rather than lean when going out of calibration which is dangerous if the user takes the readings as gospel and starts leaning at the tune

 

yes it should good info

 

Back from the dead. My AEM Wideband does the same thing. Idle is fine, WOT pegs 10.0 and I mean ANY posative boost, 1 PSI or 25PSi ------>10.0 AFR The sensor I hope is bad. I'll swap it again, it'll be my 4th time. Before it died in less than a month when I 1st got it and then the others died as well.

 

How and where is your sensor mounted? And is it an LSU 4.2 sensor?

 

It's the 4.9 Its mounted in the location AMS put on the turbo back exhaust. I shall provide pics.