Pinging in vacuum - low revs
 

Lately I've been experiencing audible pinging at 2000-3000rpm while still in vacuum. I've logged the problem with the datalogit and the ping seems to be happening around P8N6 ~ P10N7. There knock values in the PFC look normal.

I'm confused why this would be happening. It seems fine after the car warms up, and under boost there is no problems.

I'm still using the stock mod map v5.08.

Mods are 3.5" catback exhaust, trust filters, HKS v-mount. I've been trying to pinpoint when exactly it started happening, and I think it was some time after I installed the ic, but I'm not 100% sure.

I haven't had a wideband hooked up to it yet, but will be doing so soon.

I've attached the a small log of the pinging. Rows 90 ~ 130 is where it all happens.