986 Forum - The Community for Porsche Boxster & Cayman Owners - View Single Post - Has anyone used a smoke leak detector to check an AOS?

JFP in PA · 06-04-2015, 06:17 PM

A smoke system would only see external leaks, most AOS failures are due to internal leaks so the smoke would not be extremely useful. The best way to test an AOS is to use a digital manometer capable of reading 0-10 inches of water attached to an old oil filler cap. If the AOS was good, you should see around 5 inches of water vacuum signal, anything over 7-10 inches and the AOS is toast.

06-04-2015, 06:17 PM	#3
JFP in PA Registered User Join Date: Feb 2005 Location: It's a kind of magic..... Posts: 6,614	A smoke system would only see external leaks, most AOS failures are due to internal leaks so the smoke would not be extremely useful. The best way to test an AOS is to use a digital manometer capable of reading 0-10 inches of water attached to an old oil filler cap. If the AOS was good, you should see around 5 inches of water vacuum signal, anything over 7-10 inches and the AOS is toast. __________________ “Anything really new is invented only in one’s youth. Later, one becomes more experienced, more famous – and more stupid.” - Albert Einstein