Hi have you connected a vacuum gauge to the vacuum pump, as at 1500rpm the vacuum engine mounts switch off, using the tcv mounted on the air box, is the brake booster servo ok, as doing a smoke test on the inlet/boost system will not show if there is a leak there,
also when you did the smoke test what pressure did you go up to, as some smoke testers are low pressure,,
and you need to do the test at a high pressure 10-15+ psi, as it is only making the bad sound under load/boost
when doing a high pressure test undo the oil filler cap , as there is a seal that can start leaking behind the flywheel,
also are the low pressure turbo inlet pipes ok
Dave
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