engine noise

[davidmerringer]

need help, have 00 ranger 3.0l and its making a bad humming noise when i first start it. it doesnt change with the rpm and hard to tell where its coming from.After the car reaches running temp it goes away. It wont make it agian until the truck sits and is able to cool down. I know its not the belts or pulleys makes it with belt off. Also i know its not cam synconizer or sensor because they are new. i have no idea what the noise is but its driving me crazy. Any answers please let me know. thanks

 

[davidmerringer]

Also along with checking with belt off and new cam sync. and sensor there is a new AIC valve so its not the problem either. I have replaced the belt and all pulleys as well. thanks

 

[adsm08]

Auto or manual?