Hi everybody, hoping for some more help from the members on ere relating to my 04 R.

I have a boost issue. The turbo randomly a couple of weeks ago began only making wastegate pressure? When I disconnect the wastegate line from the TCV I get massive boost so turbo fine, re-connect it, just wastegate pressure again. Checked the flapper on the turbo moves freely and the wastegate is set correctly according to Mityvac? I have stripped out everything and very carefully checked all the vac lines and intercooler pipework, no leaks found after testing. Changed the TCV and BPS (MAF is only month old) and changed both one way check valves. Car is mapped with a Hilton stage 3 and wastegate base setting is 7psi. No EML or codes on Vida?

Anybody know the correct differential voltage between the two pins on the TCV connector plug? I have 14v and 0v at idle? Is this right? I have no idea where else to look?

Cheers