1JZGTE problems

[czerwizz]

Wanted to know if there were any 1jz guru's on here I know theres 2j guys but we arent the same. mods: 1jzgte stock twins, DP,FMIC, Safc2 no significant tune
Problem 1: leaning out thru the power band (before hitting full boost).
As I step into it in second thru 5th the car will get richer from 14.7 to 13ish then drop to 17 and then back to 13ish I can really feel a gap in performance it almost platueas across from 2800 rpm to 3200 then feels normal again
I was wondering if i could correct this with the SAFC and not need it tuned or IF you guys think itd be best to pay 600 for a dyno/tune sesh
Problem 2: mysterious knocking sound at idle im pretty sure this isnt a rod bearing issue as I cant hear the knocking get louder under load and I have changed the 3 times in the last 2 weeks looking for shavings but have found none. The KNocking IS NOT constant it seems to come and go I plan on replaceing the timing belt pulley b/c I think it might be cracked and causing the noise.
I will upload pictures and videos later tn ANY help is appreciated zilvia

[supersayianjim]

-you might have a lifter tick. remove the cam covers and change the gaskets. you can use 7mgte cam cover gaskets.

-do you have an adj fuel pressure reg?

[czerwizz]

@supersayianjim thanks for the tips, i have a stock fuel pressure regulator how would i know a lifter is defective, I heard somewhere that its a good idea to change the lifters if you have any noises, would you happen to know if the 2jz lifters are the same as the 1j? i'll dm flicktitty if you don't know

[di-devol]

Any engine codes? Did you have the problem before the safc? I'd remove the safc and check afr's.

[czerwizz]

I might be mistaken but I wasn't aware you could check for codes on a 1jz, what kind of reader could I use to read the codes?