Q8 6.0

Need a big help guys I tried everything just can't find where that loud whistle is coming from all I know is its in the engine bay???? It has got to be somewhere after the rotors (boosted)cos only shows up as soon as I hit boost,I have the old radix on my 2005 sierra I removed it changed all the gaskets and removed lower part and changed the lower gasket whistle is still there... Anyone have this before pls help??? Oh and also changed the injectors O rings just in case it's leaking boost from inside out that's where I thought it might be the problem.. Anyone has any ideas please

Noah Burns

iTrader: (5)

you sure you're not hearing the whine of the blower itself?

Q8 6.0

Yeh I can hear it whine prity good sounds healthy I love that sound but this whistle is new don't know where it's coming from

03sierraslt

iTrader: (22)

Can you post up a video?

Q8 6.0

I'll try there's just too much noise from other parts to pinpoint where it's coming from everything looks ok it's driving me crazy

Q8 6.0

Q8 6.0

Sry for the bad video hope you understand whats happing

03sierraslt

iTrader: (22)

I hear it, what is your pcv setup as far as hose routing. That sounds like a vacuum line or TB whistle.

Q8 6.0

I have checked and changed all the vac lines after boost and new TB gasket nothing worked.. It only whistle from 0 to 4 psi then it gos away I have left nothing else to check
. Is there a way or trick to used to help pinpoint where a whistle is coming from?? Thanks

ezdaar

iTrader: (1)

do a boost leak test. simple and easy.
links