Mortt

I put in a boost gague a while back, and recently am having problems with a boost leak, but only when the car is hot. That is, only when it been sitting out in the sun for a while, do i get the leak. Pull out of the garage in the morning and its fine, go out to lunch at work (no garage) and i'm limited to 5 psi. If i put it in chipped mode, though, boost goes right up to normal (maybe a little lower) chipped-levels. After a while of driving (chance to cool off??, sometimes boost will return to normal. Its a very repeatable problem.

So this weekend, I rechecked the BPVs (already replaced with 710Ns) and TBB, and all were fine. I picked up some OEM vacuum hose and clamps and redid all the connections that i had previously touched, including the ones to the gague itself.

Things are improved, i get a little more boost when the leak is not there (maybe a seperate issue) but the leak is still coming when the car is hot. I tried removing the gague all together (straigh hose to FP regulator) and still got the loss of power (though a little harder to tell without the immediate visual cue).

Any ideas? I've prevoiusly checked the clamps on the ICs under the car, all tight and snug..where else could it be? Next step might be to get the leak detector kit, but would like to avoid it if at all possible.

Does the fact that it doesn't show in chipped mode mean that its in limp mode? or jus that the increased flow overcomes the leak? is it that the boost is being artificially limited in stock mode? thought not, becuase when i blew the TBB before, it was limited to ~5psi in both.

No VAG-COM, so not sure if its throwing codes, but just had it in or service, and they didn't mention anything about it.

TIA

DAP@EPL

4-5 psi is limp mode. Find someone with VAG-COM to check for DTCs.

Mortt

I'll give it a go...see what comes up.