I fitted a dump valve to my car about 6 months ago and it has worked fine untill now.what happens is, when on idle the boost sits at about 0.2 below 0 where it used to sit well below that. It still boosts fine but there is no sound from dump valve when I release or change gear now. Instead its gone back to the chatter I used to get. I had the valve off and it moves freely enough. It is leaking a little air tho when on tickover. I assume its not the dump valve coz surly it would still work when boosting and releasing. I checked the seal inside and there was a small split so ive replaced it. all was fine for about 2 min then it stopped working again. I took it all apart again but all was fine. refited it and again it was ok for about a min then stopped working again. tryed refitting the standard valve but the same problem persists. not quits sure how these this work so what should i do now?

 

Bin it

 

The problem with it is that you have one

Take it off

 

tried taking it off and putting the standerd thing back on but the same thing happens. boost guage still sits to high.

 

any1 any more ideas?

 

dont put ANY on not even std! shuldnt u be cgetting a bit of vaccum on the boost guage at idle?

 

im getting just below 0. before when it was working fine i was getting .6 below 0. what do i do about all the connections if i dont put any on?

 

block the connections off.

The prob is def the d/valve. Sounds as if there is still an airleak if the guage aint where its supposed to be...

 

Have you checked all the vacuum pipes?
Are you sure there is not a split in one of them?
I know when one of my vacuum pipes come off on the saph, it would still boost properly, but the woosh from the valve was pathetic and i got chatter aswell!!!

Couldn't tell ya about the gauge though, i ain't got one yet