Now this is a guess perhaps it is PCV crankcase valve not sure exact name these are not uncommon to start making funny noises when they fail. I recently had mine replaced because there was a moaning noise everytime i started the car and would here it when it was warm sometimes. Now the part is 40 dollars if thats the problem but its underneith the intake manifold
I had no clue how to replace it so had to take to dealer 300+ for labor only
it looks like a heart with 3 holes on it
. oh ya my check engine light came on too but was misfire on one of the cylinders i had a bad coil.