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Old 03-03-2017, 05:00 AM   #16
JFP in PA
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Join Date: Feb 2005
Location: It's a kind of magic.....
Posts: 6,273
Digital manometers are used to measure the engine case vacuum levels, which should be 5 inches of water or less if the AOS is working properly. We have had cars come in with complaints of running issues and/or smoke, and found 8-10 inches of vacuum, indicating a failed AOS.
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Last edited by JFP in PA; 03-03-2017 at 05:03 AM.
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