I have an issue with my 2008 hyundai Santa Fe, when I acc...

I have an issue with my 2008 hyundai Santa Fe, when I accelerate there is a loud noise that sounds like an airplane jet engine noise before its about to take off and continues the entire time I'm driving which to me sounds like a ...

I have an issue with my 2008 hyundai Santa Fe, when I accelerate there is a loud noise that sounds like an airplane jet engine noise before its about to take off and continues the entire time I'm driving which to me sounds like a purge valve on the engine /canister is bad however when I let off the accelerator, no brakes applied at all and I hear this bad crunching grinding sound and tapping sound..what could it be? It is so annoying!!! Mechanic's Assistant: Have you checked the brake pads to make sure they're still adequate? Yep just had my back brakes done last night..I thought well hopefully it takes care of it but noooooo..still there Mechanic's Assistant: Are you fixing your Santa Fe yourself? What have you tried so far? That was the only thing that we did to try to get the noise to stop..I though maybe its a sensor in the gas pedal? Causing it to make that crunching sound..but I have no idea what it is..it was in the shop 2 weeks ago..and they replaced cylinder 4 coil pack it had a misfire and a purge valve..but there's 2 and they only replaced the one..I'm thinking the one on the engine is the one that is bad. Mechanic's Assistant: Anything else you want the Mechanic to know before I connect you? Yes and when I come to a complete stop I hear a popping sound