rb25 runs ok until warm??????

[oloo]

Ok so we just finished my s13 with a series 1 rb25 in it. I just hooked up my apexi power fc and a 300zx maf and everything seemed ok until it warms up. Small list of mods are aem fuel rail, RC 750cc inj, isis intake, 80mm throttle body, automotive fpr and fuel filter, gt35r exe. The car is still on the jack stand so it never seen the road yet but when we start it the aem wideband reads 15.1 @ 1000rpms. After idling for around 5 mins or so it goes rich as hell to 9.5-9.9 and I have honestly no idea what to do. When I try and lean it out it doesn't seem to do anything amd when its cold again it won't start from me leaning it out. I'm not to familiar with the apexi pfc so I had planned on getting tunned any suggestions would be greatly appreciated because I've been pulling my hair out over this build from day one...

[LeD ippen]

Check Coolant Temperature sensor?

[oloo]

How would the coolant sensor effect the afr?

[Eikon]

You have an issue with the motor coming out of closed loop. Could be a bad O2 sensor. Do some searches on "closed loop" to see what you come up with.

[l0nestar]

I immediately suspected coolant temp sensor.
Closed Loop +1

[oloo]

I don't have my wideband hooked up to my pfc should I make sure that it has an o2 streaming to it ?