Knock question

[94Jettameowpsst]

Mods in profile.
Im still on my stock fpr and original fuel filter (so it looks to be atleast).
Boost pressure is irrelevant because it doesnt matter where its set to but when i "get on it" it knocks consistently inconsistent from 4800rpms and up. When this happens though, or as soon as that rpm range comes around, my o2 voltages go from .91+ to .08-.06.
Could this be a clogged filter because my o2 sensor doesnt even have 500 miles on it...its a brand new bosch.

Oh and my 650s are only at 76% idc at 24psi on my turbo.

 

[scottsee]

post a log.

 

[XtremeRS2gnt]

If it's truely knock, and the o2 is reading that lean, then it's most likely a fuel delivery issue. It would be best to monitor fuel pressure in boost, to see where its at. If pressure is dropping off, then a clogged/dirty fuel filter could be it, or even the fuel pump not being able to deliver the needed fuel flow and pressure..Rewired the fuel pump? I dont know if I would trust the stock FPR at those boost levels either, but i'm sure some will say it should work ok.. I would look into a fuel pump rewire if not yet done, and a good aftermarket 1:1 FPR..that there may solve the issue..You do have a Walboro HP fuel pump in the tank right?