BicuspiD

OK I have searched, and checked everything from the y-pipe to the TB, CCV, BOV, and all hoses (IC and the 1" ones). Everything is intact and seems to be working.

I still get a boost leak under load, although it seems to pull fine and I have 10+ psi on the gauge. Upon testing and testing, it appears when I give the car light throttle, I can feel air coming out from behind the intake manifold.

The only culprit I can see it could be a 1" diameter hose that connects from the secondary turbo air filter, runs next to the crossoverpipe/above the air pump hose, to a tube which curls around under the UIM, behind it - What does this lead to? I redid the vac hoses a few months ago and cant for the life of me rememebr where it goes. ACV maybe? Is it capable of leaking boost?

BicuspiD

Noone knows where this leads to? Any way I could test it by capin g it or anything?

BicuspiD

I disconnect the air pump at the connector, and when I perform the same tests (blip the throttle with my hand), I do not get any moving/escaping air behind the UIM. When the car is under load however, the venting sound is the same, and it is a little sliuggish to build boost either way - same performance. Boost levels are normal, if a little slow to achieve. So would it appear the ACV is the problem? From what I can tell it takes the output from the airpump, and either routes it to the catalytic converter, or the exhaust manifold - is this correct? there are also two check valves - a "split air" check valve and a "port air" check valve. If either of these is bad would it cause the problems I am having? I am about to take the UIM off to inspect all the connections, and the ACV itself, but would appreciate any insight.

Snook

iTrader: (12)

hmm
sorry i dont know much about the emissions stuff maybe someone else can help out. A picture couldn't hurt as well