Stall, whistle, running rich = BOV?

[240sxinlv]

My car just starting stalling.

I have a 97 with the greddy kit.

It never use to stall unless I was really high in the rpms and pushed in the clutch, still even then it was rare,

The last couple days it will stall every 10th or so time I push in the clutch no matter what rpm I was at.

I then heard the slight whistle,

Then I noticed it only stalls if it starts whistling as soon as I push in the clutch.

BOV leak? < thats my only guess. (Greddy RS non-recirc)

My AFRs are a bit off ALL the time. Use to be the same for almost 2 years solid.

Old AFRs - Idle 14:1 / no load ~70mph 15:1New AFRs - Idle 13:1 / no load ~70 14:1

Thanks!!!

[WDRacing]

A vac leak will lean your AFRs out at idle. IS it only stalling when you've been in boost or does it stall when you simply push in the clutch?

[240sxinlv]

Before this started it would stall once and a while if I was in boost and way up there in the rpms.....push clutch in....stall.

NOW it will do it every 5 to 10th time I push in the clutch, no matter what condition.

[Edub1]

That is strage. Does your BOV stay open at idle? I don't know why so many are over looking this when it is so damaging. Inspect your throttle plate - if there is black gunk, even a small amount, scrub it out with a toothbrush and carb cleaner. Don't flood the engine with the cleaner.

This can also cause surging at idle so if you are noticing that...