So below is a video i made of my afr cruising in 3rd at 35 mph. Can someone yell me what is wrong? My tuner said it could possibly be my upstream o2. I just want everyone elses opinion. My mods are in my sig. I am retuned. This also started happening even before i was retuned. Spark plugs are all good also. Thanks

http://www.youtube.com/watch?v=yX03uuhUoio&feature=youtube_gdata_player

 

Tell*. P.s this guy has been tuning me for 3 years n never had an issue

 

Near the end i shifted into 4th. It would of leaned out tho if i recorded longer

 

Probably 02 sensor. Sick that's it's spiking so lean.

No CEL or codes or anything right?

Very weird

 

Not a damn thing. N i dont even know how to get a part number for a upstream o2 sensor... Smh

 

What are your fuel trims like ? Just wondering cause they should be way out of whack and might throw a DTC with it running that lean. If they are good that might tell us something too.

 

Im dealing with similar, but my wideband is stuck on 10 and blinking, I emailed my wideband maker to see if they know what it means, and my tuner to check trims.

 

Thats the thing everytime we tuned. This problem magically went away

 

Bumppppp has anyone ever replaced their upstream o2?

 

O2 sensors go bad, it's a possibility.

Change it and see if there is a difference. If it's going away every time you tune, it may be a fuel trim problem, which sounds like an O2 sensor issue.

 

Yea im going to change it next friday. I cleaned my maf sensor in hope that was it. It wasnt lol. So tomorrow morning before i leave work ill order the upstream n just wait it out.