I cant seem to pinpoint when i first started to remember hearing it, but i'm pretty sure it's after i replaced a failed fuel injector and spark plug
I'm pretty sure it's detonation. Kind of sounds like a diesel when it happens. It happens at low rpms what i imagine is peak torque, highest compression, only under load, and mostly happens during the transition from light to medium acceleration,
I tried retarding the ignition but that barely helps.
switching from 87 to 93 seems to help quite it down a bit.
I've got an aftermarket temp gauge on the car, and it happens pretty much at all temps, slightly worse at full temp with 87 gas.
I dont think it's an overheating issue
this is actually a low mileage s13 ka motor
at this point i just need to stop or lession the detonation until spring when i can take the car off the road and dig into it deeper.
i think i'm just gonna try and go full retard - i meant as far as it will go. and maybe try disconnecting the knock sensor to see if maybe that makes it never try to advance timing at all.