my car has been starting to smell like this a little recently. it's barely noticable.

i know i've been running quite rich recently. like, insanely rich. i simply can't get my fuel trims correct. my static pressure is around 25-28 psi of fuel (415 cc/min injectors) and my idle is around 12 psi (that's the only way i can get fuel trims around 0%) i tried taking about 1/4 a turn out of the bleed valve on the S-FMU (equiped with the standard silver spring, and the 2.72" disk) at a time and fuel cut seems to increace as i take more turns out. as boost goes up to 10 psi, oxygen sensor voltages (using corbin's A/F gauge) seem like this:

1.002 1.000 .990 .970 .940 <hit 10ish psi>

car hesitats, "minor" fuel cut, oxygen sensor voltages fluciate between .840 and .930, so i back off. i don't want to break anything running lean.

idealy, i want to see my oxygen sensor voltages at like .930 from 0 to 12-13 psi idle to redline, but no matter how hard i try to mess with my fuel pressure it's always at like 1 volt unless boost is 10+ psi at which point i get fuel cut. i have the missing link, and my AFC (no correction) says voltages are around 4.55 volts, which sounds good. my settings are 5 in and 5 out for the pressure sensor, i found that works better than 6 in and 6 out or 7 in and 7 out.

oh yeah. time to get back to the topic. a slight sulfur smell means that my oxygen sensor is about toast, right? it could also mean that my cat might be clogged, which is a possibility i guess seeing as how i've been running insanely rich for 4000+ miles...?

help?

2016 WRX STi Limited (current)
2001 A4 1.8tqms (donated)
1991 GVR4 #1933 (sold)
old.dsmregistry.com/detail.php?carid=218 (dismantled)