2003 TDI 130 was dropping out of boost and into limp mode almost everytime the turbo kicked in .
Today I changed all the vac pipes for silcone piping and now it seems a lot better , by that I mean it will rev right through and has only done it once since ( dropped off boost )
The only fault code I get is for a negative pressure deviation .
I have some Innatec turbo cleaner which will be getting done next ...
Two questions .
1. there is a one way vlave ( black and white ) in the vacuum system , could leaving this off cause the boost issue ??
2. how can I test the N75 valve and what symtoms would it give and wojld they be constant or intermitant??
