Re: not foolish at all...good observation - Saab 900 Bulletin Board - Saabnet.com
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Re: not foolish at all...good observation
Posted by JohnK (more from JohnK) on Tue, 1 Oct 2002 16:09:29
In Reply to: Rephrased question: Could boost gauge indicate vacuum, RayV, Mon, 30 Sep 2002 17:22:09
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The 8 o'clock position is normal and 10 o'clock at idle shows a vacuum leak. With further evidence of high idle. Tracking down the leak is another story, but once you have found it, the vacuum gauge will be back to about 8 o'clock. I have had good luck finding leaks with a small propane torch. Simply turn on the propane valve and direct gas all around the intake system and hoses. Idle will increase whenever propane gets sucked into the engine. Carb spray works, too.
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