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Discussion Starter · #1 ·
So I have a '99 Viggen with 173k on the clock. The motor was rebuilt about 4k miles ago, but the turbo was completely fine (no play).

A couple days ago I noticed that as soon as boost hits atmospheric, I hear this whistling noise (it almost sounds like the warning fork on brakes) up to about 2-3 psi and then it goes away and sounds completely normal. I'm wondering if it's the turbo itself, or possibly a vacuum leak somewhere. Anyone ever seen this?
 
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