after drivin my car like back and forth to school. I would open my hood and i would hear some high pitch popping noise. what could that be from? Sounds like something is boiling or something. the car is kinda hot but its still in the middle on the hot and cold meter. I also put the 300z fuel filter in my car today! yiiiippee my first engine job!!!!!

 

where is the sound comming from? that could help determine wha the cause could be.

 

i dunno, after i turn it off i just hear high pitch poppin sounds.