Pssssssh Sound From Vacuum Hose

[SargeRX8]

Hey guys,

Today while under my bonnet I noticed a pssssh sound. Sounded like air running through something.... or leaking. I started listening around and heard it from a piece of hose on my boost controller. I pinched the hose and the sound stopped. I applied soapy water all over the hose to find a leak and found none. I started pinching other random hoses and the sound was there, but if I pinched the hose coming off the TB which leads to my Y piece to my boost controller/waste gate line, the sound stops. The sound is audible across the hole line, not where I initially thought.

The line which comes from the TB to trigger the BOV has been Y pieced to support my boost controller. If I pinch the hose from the Y piece leading to the BOV, nothing happens. If I pinch anywhere on the line going to the boost controller, the sound stops. If I pinch the line going out of the boost controller to the WG, it stops. If I pinch the light right up near the TB, the sound stops.

Is this a leak or is it a normal sound? My Greddy Profec B reads -94 most of the times. Sometimes I get really bad hunt and it drops to -80 and revs follow.

Any ideas guys? Should I just replace all the dry hoses? Is 3mm ID the best overall size to go?

Cheers

[Sunkist]

could your wastegate have a leak?

[SargeRX8]

Standard internal wastegate. I was actually thinking it could be this because

pinching the line right near the wastegate nipple will make the sound stop! There is nothing else to pinch so that tells me the sound is coming from the wastegate because if it was before the wastegate it would still be audible. Ahh shit balls lol.

[Thelen]

Sounds like wastegate to me as well. I'd also try removing the boost controller just to remove that from the equation.

[GTScotT]

Sometimes I pitty you lol. Where oh where does it end..

Cut a sample of the hose (for size) go to repco and buy a few meters of it for under $10. Go home and install the BRAND NEW HOSE that does not have any holes in it. See if the leak is still there?

How bout you also note, if you undo the hose from its source (with the motor off) and suck/blow in it, does it makes a hiss sound from the pressure of your own breath?

[Thelen]

Wow good suggestion, I didn't think of taking it off

[SargeRX8]

Happens when I blow into it and goes away when I pinch at the wastegate nipple. Is this a problem? Cause of my random 14psi spikes? The sounds is also easy to pin point from the wastegate area.

Edited April 15, 2011 by SargeRX8