Everytime I connect the vacuum line on the dv I get no boost at all ,once I disconnect the vacuum line from it I drive it for a little bit and it starts boosting all the time . Any1 have an idea what's goin on , I need help I'm very frustrated

 

It's probably sticking open, and is bad. See if you can source a cheap used one to see if it fixes the problem. There's a way to test it I believe by disconnecting it and pressing it open, it should stay open? Someone will chime in about how to test it

 

it opens because of vacuum, when you close the throttle, there is a vacuum in the intake manifold.
what you need is a vacuum pump. remove diverter valve and attach vacuum pump to valve and it should open, if you relieve the vacuum it should close. if it doesnt, you can remove the top and try regreasing the diaphragm... dont drive with out it connected, you will do damage to the turbo and possibly throttle body over time.

 

Ok thanks , the valve was recently replaced like 3 months ago . When I took it out I pressed it in n it wasn't staying it closed right away . But wen I put the vacuum pump to it , it does stay open .

 

Is there any possibility that I broke it by cleaning it with gum cutter lik a month ago

 

Or could the valve be plugged in backwards ?

 

heres a makeshift diagram lol.




but no that wont make it stick open.unless your boosting it might push the valve up if it was installed backwards... take it out and clean it..

Audi area: Audi A4 B5 DIY: Install/Cleaning of Aftermarket Diverter Valve

 

I finally found the problem , one of the hoses from the n75 to the turbo had a hole in them , I wasn't able to c it becuase it was very dirty . Thanks for all the help , really appreciate it

 

Glad you figured it out, now if someone has similar symptoms we have an idea where to immediately look.