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I have a 2000 9-3 SE. The past few weeks the turbo has been starting to loose its power. I've noticed this at highway speeds at a constant speed of 70mph. Outside temperatures (Minnesota) have been 20 degrees or so and each time I have noticed this the car had only been driven about 15 minutes from cold. The turbo needle drops to 0, the car looses a little power. This has happened about five times. This morning, the same thing happened however I could hear a bit of a hissing noise too.

What might the problem be?

Thanks!
Christian
 

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If a visual inspection doesn't show anything, you will either need an intake pressure tester or a smoke machine. IME, smoke machines aren't great when it comes to turbocharged cars since they dont simulate high intake pressures which can cause marginal parts or connections to fail.
 
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