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Old 09-13-2012, 01:56 PM   #32
amalgrover
Scooby Specialist
 
Member#: 183480
Join Date: Jun 2008
Chapter/Region: South East
Location: Valdosta, GA
Vehicle:
2011 Audi A3 Quattro
2009 Forester XT

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the few times i have seen the issue you are describing it has been one of two things...

the wastegate stuck open, and actuating it by hand fixed it

...or...

the boost controller was messed up, was replaced, and was good to go


...since you said you have tried 2 different boost controllers, i would think the problem is not in the boost controller. so either something is wrong with the wastegate, or you have a decent sized boost leak. remember, a boost leak is going to automatically be a vacuum leak at idle, and while sometimes the leaks will not show up until the motor is in boost, alot of times they are present 100% of the time. this means that you could take a can of carb cleaner, and with the engine running spray around the vacuum lines, intake manifold, intercooler, etc. and see if the idle changes. if it changes when you spray somewhere, you found your leak. this doesn't always work, but it does work alot of the time.
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