ii heard before work tonight, and when i came out she made this really weird howling sound when i started her tonight, when i revved it alittle it got louder and more noticeable. its def on the drivers side. also what sounds like a marble rattling in a jar, is coming from the passenger side. sound doesnt start till around 1500 rpm. been doing it for awhile. any ideas guys?

she is almost due for her oil change too... thanks for the help guys.

 

Mine does the same thing, the howl isn't bad, but the spray can rattle is what it's going to the shop for today.
I think it's the emission contaminating the oil and diluteing it with diesel fuel.
It rises to over the full safe mark, has since new.
Also low top end power while underload. Timing knock is also louder after the last reflash. Oil change lite has never came on.

The rattle starts after the engine has warmed, it's intermintant, usually can hear it from idle to around 1500 rpm's. I've even heard it going down the road at these rpm's.

 

mods, i need this moved to the 3rd gen engine and drivetrain 2003-2007