need help fixing motor running lean

I am running lean I take it cause my spark plugs are white as can be at the moment and when I smog I am putting out high NOx...whats the best way to richen up the motor but I dont want to be spitting gas out the exhaust from not being burned...

Had this same problem on my 88 1.5 DX. Turns out the timing belt was off a tooth. Kept throwing O2 sensor codes and pinging on acceleration. Got great gas mileage though!! :grinyes:

What engine and ECU do you have?

its pm6 or whatever everything pretty much stock on my d16a6 but header and CAI....and o2 is new. and I was wondering why my car seems to get so hot I check out the spark plugs and they all white as can be but ring is black so I take it runs rich at startup(warmup)...

I check timing 10 times and seems to be good but can it hurt if timing belt is too tight?