Re: Dead Turbocharger? - Saab 9-5 Bulletin Board - Saabnet.com
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Re: Dead Turbocharger?
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Posted by Dean [Email] (more from Dean) on Sat, 10 Sep 2005 14:39:48 Share Post by Email
In Reply to: Dead Turbocharger?, Jon Jennings, Sat, 10 Sep 2005 12:27:40
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could be a hose popped off or split, bad BPV, wastegate stuck in open position, bad BPC or its VAC line

remove WGA hose and in a quiet traffic situation and a very careful throttle, see what boost you can get*, if lots of boost, boost control system is bad, otherwise, wastegate is stuck open, turbo siezed (unlikely) or system has a large leak (incuding a bad BPV)

* refit hose asap, do not push far into red if you can get there, if you hear any sign of knocking, stop and refit hose. If you overdo boost, you will get a limp home mode until you shutdown and restart

the downpipe can be removed and you can turn the turbine by hand and feel if its is free, the wastegate lever can be manipulated to see if that is stuck... rare but has been reported

If you have a bad BPC, try blowing it out every which way with compressed air, borrowing a known good one is a very good test.

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