B5.5 1.8T Intercooler Silicone Hoses

They will not work on the throttle body to intercooler connection unless you have a clamp on connection. 2003+ IIRC had a connector that was held in with a clip. I believe it has an O-ring that you can try replacing first, if that is where you think you are leaking from.

Correct, mine has that clip and I should definitely check those orings. I took it all apart and thoroughly cleaned the intercooler end of last year and I remember inspecting the hoses really well to find for and ruptures.

I hear this hissing after the boost goes up, past 3k rpm coming from the front end I suppose on the passenger side.

I still get boost but I hear the hissing so I’m pretty sure the leak is in the intercooler/charge pipe hoses. I also randomly get P0299 codes sometimes, not always though, which probably means it’s a small leak somewhere.

I did not check the turbo outlet hose where the DV is attached to, maybe I should take some time this weekend and put it into service position and try to inspect that hose. I installed a brand new DV when I cleaned the intercooler by the way.

check your pressure control valve, the positioning of it on the hose that connects to crossover tube/pipe from the turbo tends to get a little oily and susceptible to leaks.

cchief22 said:

check your pressure control valve, the positioning of it on the hose that connects to crossover tube/pipe from the turbo tends to get a little oily and susceptible to leaks.

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Yep.

Basically, any connection between the turbo and the intercooler is suspect, too. They're the low points of the system and tend to get oily; especially by the turbo.

That makes sense, I'll check it and see what's going on.

Do you guys have the part number for those o-rings that go on the connections to the intercooler?

I knew one person who put a large clamp over the clip to try to tighten the connection. It seemed to help, but that was 15+ years ago.

Cirillex said:

That makes sense, I'll check it and see what's going on.

Do you guys have the part number for those o-rings that go on the connections to the intercooler?

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Not a separate part number. You'll have to measure the diameter of the groove it sits in and find a generic replacement. To test, you could always do a couple of wraps over the o-ring with electrical tape to get a tighter seal.