Only noticed this a few days ago, but now the AFR's on my s/c B18 is getting worse. Under part throttle cruising, it used to be 13-14's, now, its now like 13, 14, 15 and 16 then 13-14 again (very random) under WOT MOST of the time it goes to 11's -mid 12's. From light/part throttle from 14 it usually goes straight to 13, 12 and 11, Nowadays it thinks about it, boost is building and it goes from 14, 15 then 13.. stays there for ages and its gone to the point where I back off as I do not wanna blow my **** up.

Would could this be?? I've tried 3 tanks of different fuel now.. Fuel filter is fairly new covered like 4k miles.

I'm outta ideas. Maybe a screwd O2?? (I'm running a PLX M300) using the w/band only. Its covered 2k miles so far since install...

What else can I check?

Thanks in advance.

 

bttt

 

Bump