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hi all this is my first time on a forum and my first time asking for help, my mk4 golf diesel seems to loosing power its like my turbo is not working so i tried google and got info it was my maf sensor got new one from vw and tried it but car is still the same so been reading on net all day and it seams it could be my n75 valve or turbo vanes oh joy, could anybody tell me how the vacuum pipes should be routed i have the asz engine any help would be much appreciated.. thanks..
 

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There is a vacuum diagram under the hood on a sticker.

Check all the vac lines, all the way to their ends. Even better is pressure testing them with a hand pump AND air compressor to test both vac and pressure, or just replacing them. It's possible the n75 or turbo vanes are sticking, there's no way to guess over the internet so here is a start of where to start looking: http://www.myturbodiesel.com/1000q/multi/limp-mode-TDI-fix.htm

welcometomyturbodies
 
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