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Sounds like a failing BPV... (pun intended).
Posted by REM in Seattle (more from REM in Seattle) on Mon, 10 Oct 2005 19:50:17
In Reply to: bpv bad? boost noise, etc., jpr, Mon, 10 Oct 2005 19:33:28
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The infamous "hotter valve" aka BPV, tends to sound a lot like a goose honk when they begin to fail.
You can replace the BPV with the newer "viggen" approved Bosch BPV which supersedes the older Bosch BPV for about $40, or switch to something like the Forge Motorsport or Hyperboost aluminum piston type BPV for around $125. The only real advantages to the piston type BPV is they can handle more boost pressure and can be cleaned and rebuilt nearly indefinitely.
REM in Seattle
2005 Saab 9-3 Aero Convertible; 5-speed; 6000 miles
1998 Saab 900SET; 5-door; Automatic; 79,000 miles
1984 Saab 900T; 3-door; 5-speed; 242,000 miles (RIP)
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