I owuld suggest you upgrade to a Forge valve, or you can get a TT DV, but those have been know to fail as well when the car is chipped. If your DV "honks" then this is a clear indication that it has failed.
check first for any hose leak!I thought yesterday that my RS6 DV had failed (same simptoms),and when I went underneath to replace it,I noticed the hose from turbo to FMIC,was half way disconnected,escaping boost!
Rogerius has a good point. On our cars if the intercooler hoses arent attactched securely, you can get a stuttering noise. I was left stranded at a gas station an hour and a half away from home. When I was passing a car on the interstate, I blew a hose. I didnt know anything about it but Ill check things out next time if it happens again.
Vacuum hoses, DV, and intercooler hoses are something to check if you are stuttering and loosing boost. If you take the DV out and compress it, is the spring stiff? If so, its possible that the diaphram inside is broken, and you are only left to replace it.
Forge's arent known to fail, and if they do, they can be rebuilt.
generaly speaking,if a diaphragm DV is failing,u have to hear the honking sound first.What I heard (I keep the radio switced off to hear the turbo wheen and exhaust groan) was a PHSHAAAAAAAAT...Lost boost!
I'm seriously considering to keep permanently in the trunk the car jack and stands!!!!!!
Plus a spare DV and a spark plug coil :heart: :b5:
Scuba 2001 :thumbup: :thumbup: :thumbup: