3rz tapping at idle

i have a 98 3rz that i just rebuilt and i cant figure out what the problem is if the motor is cold and i start it their is no noise it runs smooth and the oil pressure light is off at idle. once it gets to operaiting temperature their is a very noticeable tapping noise coming from the top end and the oil pressure light comes on at idle. once i go just above idle the light and tapping noise go away. Running 10w30 has a new oil pump and oil filter rings are sealed please help!!

 

When you rebuilt you torqued all connecting rod caps, main bearings and everything to spec? Believe it or not not doing swill create a gap and decrease Oil Pressure. just a thought.

 

Yes made sure to do so but i am going to check the caps holding the cams in tomorrow. And if they arent to spec wouldnt it be tapping all the time not just when it is warm?

 

All oil passages cleaned out? could come on when it gets warm as oil thins out

 

Thats what i was thinking if thats the case what can i do to fix it??

 

Well the quick fix would use a heavier oil and see what changes. Other then that I'm not to sure man sorry