R33 Boost Leak

[Nevastator]

Hi guys, I was on the road on Saturday and while on boost I noticed something fall on the floor at my feet...

Its a small bit of rubber which I assume covers a vacuum line or something similar but I haven't had a look at it in the daylight yet. Now when I drive the car without being on boost it's fine and I can't feel or hear anything unusual. However, when the car is on boost I can hear (and smell) air leaking from around the area next to the pedals. It seems to be somewhere under the dash under the steering wheel. I know it's leaking from somewhere because I can not only hear it but i can also see it on the boost gauge dropping from 17 to about 14psi...

The car is a 1993 R33 GTS-t.

If anyone has had this happen to them I'd appreciate any help as to where this rubber plug sort of thing came from or what the actual issue is.

Thanks in advance

Nev

[Kane_R32]

There really shouldnt be any vacuum/boost lines running into the cabin from factory.

So you're going to have to have a look at what lines run into the cabin via the firewall and track them under the dash. You'll probably find an old boost gauge pvc (sp) hose that some one has just blocked off when they removed a boost gauge prior to sale.

[Stock e-Tune]

its not off the heater control valves?

not use if they are vacuum or electronically driven.

[GTSBoy]

Skylines don't use vacuum to control the heater dampers. It is definitely from a removed boost guage. Start on the engine side of the firewall and look for any boost hoses going through near the clutch master etc.

[Nevastator]

Thanks for the replies, I'll have a look at the boost gauge lines this weekend. I know that the work done prior to me buying the car wasn't the best quality so I'll check it all.

Cheers guys