what are the signs of a failing DV????
AudiWorld Super User
Joined: Aug 2000
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Nonsense - the lift-off "chuff" is normal...
When you instantly take your foot off the throttle when the turbo is providing boost, the pressure has to go <i>somewhere</i>, thus the "chuff" noise as the DV vents the extra pressure. That's the whole point of the DV.
Now if you have a honk when applying the gas, <i>then</i> you have a DV problem...
Now if you have a honk when applying the gas, <i>then</i> you have a DV problem...
New Member
Joined: May 2000
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For the record, there are at least two different symptoms of bad DV; one is "coke-bottle"
We're not talking about the normal turbo "chuff" sound, but rather a sound reminiscient of blowing across the top of a coke bottle (sometimes also described as a soft hum or honk).
With a bad DV, his sound can often be heard under very light acceleration between about 2,500 and 3,200 RPM. (that's how it manifested itself in my car, from mile 1)
With a bad DV, his sound can often be heard under very light acceleration between about 2,500 and 3,200 RPM. (that's how it manifested itself in my car, from mile 1)
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AudiWorld Super User
Joined: Sep 2000
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From: Texas
Not quite nonsense...
The DV should provide a short, quick release. Not an impression of Jimmy Durante!
When the piston gets hot it gets sticky. When it gets sticky, it doesn't release in the normal manner. It 'stutters' for lack of a better word, creating a 'skittering' sound.
These were my DV symptoms.
Others have mentioned a Coke bottle sound that I never experienced, but thought worth mentioning.
But, 'nonsense' is a little harsh. Especially when I described something I experienced that was remedied by a new DV.
When the piston gets hot it gets sticky. When it gets sticky, it doesn't release in the normal manner. It 'stutters' for lack of a better word, creating a 'skittering' sound.
These were my DV symptoms.
Others have mentioned a Coke bottle sound that I never experienced, but thought worth mentioning.
But, 'nonsense' is a little harsh. Especially when I described something I experienced that was remedied by a new DV.
