What could it be ive tighten all hoses no leak

 

have you dont a boost leak test? if not do it and go from there. what is the afr at WOT?

 

At wot it tappers down to 11.5


Changed maf and ajusted air got it back up to 12.4 tappering down to 10

 

ok.... now you said no leaks? so that means you have done a boost leak test yes?

 

Sounds like a bad O2 sensor. Any cel?

 

Cel is on could it be on the o2 housing?

 

+ 1 for bad sensor. Which wideband? how long you had it?

 

Did you pull the code?

 

I'm leaning toward a bad front O2. You don't need to replace it with stock there are a lot of choices for way less $$$.

 

buy and lc1. if you already have the lc1 buy and new sensor. calibrate. hard wire it to the ecu for your rear o2. done and done.

okay so there are a few other things involved like tuning and stuff but you get the point

i hardwired mine in 2 years ago... calibrate every 3 months or so and haven't had a cel since

 

check a log and see what the front o2 reads. Easy way to tell.