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Boost Diagnosis, Step 2
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Posted by Bryce [Email] (more from Bryce) on Sat, 19 Aug 2006 11:42:16 Share Post by Email
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Hello All,

First, thanks to Dean for providing the BPC diagnosis procedure. I beleive that I have proved that the BPC is functional. Now I need help with the next part of the diagnosis. The symptoms are low boost pressure under acceleration. The boost pressure gauge maxes out at 1/4 yellow. So far I have done the following:
1) Remove BPC, spray with WD40 and compressed air. There seems to be a path from W to C. R seems to be closed.
2) Check und the TB shroud for loose hoses, none found.
3) Remove W hose from BPC. Immediate boost improvement ... gauge goes into Red.

Now I know that the system can make boost. The next question is, what do I do next? Does this test show that there is a problem with the WGA? Or perhaps with a valve in the BPC? Does anybody have a schematic diagram of a BPC? How many valves does it have? Are they vacuum actuated or electronic?

Please help. Thanks. A link to Dean's advice from a couple of weeks ago is included.

posted by 66.75.234...

http://www.saabnet.com/tsn/bb/NG900/index.html?bID=236704

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