Grant74

iTrader: (10)

Any suggestions as to why my vacum is at zero on idle, and only goes negative with a little throttle? It does go positive on boost as it should but means I have no effective DV.

I have removed the carbon can and replaced it with a 3 way joiner ensuring all one way valves in right place.

My icv is also vented to atmos, and breathers go into vented catch cans !

I'm guessing its something simple but stumped at the moment!

scoobyricht

iTrader: (4)

Must be a pipe off the manifold someware. take a good look around and i wouldnt drive as there is a good chance u have a lot of unmetered air going in. check all pipes on the manifold for leaks.

Grant74

iTrader: (10)

Been back through the pipes and only thing I can see is the icv ( the box to the left of the intake with the coolant pipes connected ) sucking in air through the breather filter- could hat be it as clearly under vacum?

Normally it's connected to the intake pipe

WhiteWagonMan

iTrader: (34)

Use some brake cleaner or soapy water on all the vac pipes and especially all the pipes/connectors you have recently changed,im sure it will shows itself.