g4zawd

I recently fitted a ProSport boost gauge, it shows boost like it should, but the gauge also spins round to the max position when I brake, it didn't do that when I first fitted it, but it does now. Any ideas?
Car is a Ver6 Impreza UK model.

Steviestdi

Did you go into the right vacuum pipe?

g4zawd

I used the spare pipe to left of coil pack which was blanked off, seems to be the one others use for boost gauges.

piehole1983

iTrader: (7)

Is your dump valve maybe stuck closed? Have you checked the vacuum hose going to it?

g4zawd

I'll check the pipe, can check valve too, I assume that if the vale is free to move it should be ok, is there any other way to check operation?
Thanks for the reply

piehole1983

iTrader: (7)

It'll have a spring holding it closed so there'll be a decent amount of resistance. It should be able to slide closed freely though once you've pushed it open. Is it aftermarket?

g4zawd

It is a standard valve, took it off earlier, seems to be sliding properly so refitted, start engine, pressed brake pedal and it had no effect on gauge, took the car for a drive and its doing it again! Looks like its a problem with the valve then. might take it off again and give it a good clean to see if that helps, if not , I'll have to find another. Thanks

piehole1983

iTrader: (7)

Is the vac hose going to the top of the valve ok?

g4zawd

Yes, the hose from the valve that runs to the inlet manifold looks fine.