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Re: Lack of Boost
Posted by Larry West - http://saabnet.com/tsn/forms/e.php3?e (more from Larry West - http://saabnet.com/tsn/forms/e.php3?e) on Fri, 4 Apr 2003 13:08:26
In Reply to: , Kok Chen, Sat, 17 Dec 1988 12:00:00 

'Vacuum' is the proper spelling.

Actuating the bypass valve will get you nothing on the wastegate. They 
are: a) not interconnected, and b) operate on different principles.

With the motor off, there isn't much you can 'test' on the bypass valve 
unless you remove it from the car so that you can see it's operation. 
If it holds vacuum, it probably is working right. The wastegate needs 
to be checked with pressure, not vacuum. If you have the MityVac that 
does both, be sure to change whatever it is you change to get pressure 
for testing the wastegate, and connect it to the wastegate. The 
wastegate should open at about 5-6 PSI. The exact spec will be in the 
manuals.

Check also that the gauge is working properly.

Good luck!
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