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Andy,
The sounds You're hearing could be indicative of the turbocharger rotating assembly (compressor wheel/turbine) contacting their respective housings which typically produces a change in turbocharger vocals.
This contact is due to wear at the turbocharger bearings or thrust assembly as this will lead to movement of the shaft and almost always leads to eventual oil seal problems (oil bypassing, smoke in exhaust, etc).
Remove the intake boot from the turbocharger and grab the compressor wheel shaft nut with your thumb and index finger. If you can feel much in up and down or in and out(axial) movement, the turbocharger will need replacemnent or overhaul.
The T25 turbocharger of your CSE is DIY rebuildable and the kits for these would be the least expensive option (under $130) but a complete replacement (cartridge) would be a second option at under $500.
Hope this helps and best regards,
GaryK at SWEDISH DYNAMICS,INC.

http://swedishdynamics.saabnet.com

• Can turbo failure induce smoky exhaust?, Andy (West London), Tue, 23 Oct 2007 08:27:27
  • Re: Can turbo failure induce smoky exhaust?, SWEDISH DYNAMICS, Thu, 25 Oct 2007 11:47:28 <-- Viewing This Message
  • I am not convinced this is turbo..., Chaz, Tue, 23 Oct 2007 17:22:54
    • Black smoke is an indication of an overly rich..., Street , Tue, 23 Oct 2007 22:50:59
      • Speaking as one who has burned a few turbos..., Chaz, Wed, 24 Oct 2007 04:01:46
        • Black will allways be black but..., Street , Wed, 24 Oct 2007 12:12:54
          • Fair enough. Best, C n/m, Chaz, Wed, 24 Oct 2007 15:04:57
  • What does steam smell like? :-), Street , Tue, 23 Oct 2007 15:04:13
  • Check your turbo bearings, David Ingram, Tue, 23 Oct 2007 10:12:38

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