olskurida

hey guys i need help. i have a b16 in my 92 hatch, it has the radiator that spans the whole radiator support (forgot which car it came out of), the needle on engine temp gauge on the cluster usually stays around the "C", but once it gets up towards "normal" engine temp area my CEL comes on (which only happens during hot days or when im chillin at a red light for a while) I thought it was because of carbon build up but i just did the seafoaming thing and its not the knock sensor itself because i replaced it with a working one, still the same problem.

another thing Could it be im running too rich (i have stock internals just intake, header exhaust)
when im cruising for a bit and then yet off the gas the exhaust makes these poppin noise. This one time during a road trip i was following my car while my bro drove it and when he yet off the gas this small fire ball shot out the exhaust! Any ideas?