Turbo whistle / power
My 04 JTD GT has developed the no power syndrome at low revs (below 2k) so researching indicates its and EGR issue, unfortunately too dark to check.
But, whilst researching found this line
'Whistling at 1800 rpm is the turbo spooling up which is correct. No whistling means the turbo isn't spooling - no power low down. The turbo vanes aren't being pulled into high boost mode, boost solenoid isn't controling or vac pipes are leaking'
Now I have never heard a whistling in the 11 months of ownership, or perhaps I don't know what I'm listening for, how audible is it? Should I hear it clearly from within the car as if hits the 1800 mark?
Is there an easy test for the solenoid? or to check vac pipes and where would I find these in the engine bay. I'm okay for the EGR as previously cleaned my 156.
I have no error codes, could there be a parameter to check via the obd connecter?
Thanks for any help/pointers