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Old 06-04-2015, 01:24 PM   #1
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Has anyone used a smoke leak detector to check an AOS?

As the title states... Has anyone used a smoke leak detector to check an AOS condition? Can it be used? Would you put the smoke in the intake ( or even the upper AOS hose) and look for smoke in the oil fill or put smoke in the crank case (oil fill) and look for smoke at the upper hose?

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Old 06-04-2015, 05:53 PM   #2
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I am assuming that at rest the AOS is closed and fumes cannot enter the intake. But if the diaphragm is torn the smoke will pass thru the broken diaphragm and enter the intake.

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Old 06-04-2015, 06:17 PM   #3
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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.
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Old 06-05-2015, 06:02 AM   #4
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wishful thinking, I just hoping there were other ways to diagnose issues such as the AOS
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Old 06-05-2015, 06:24 AM   #5
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When my AOS failed recently I could barely remove the oil filler cap due to the vacuum.
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Old 06-05-2015, 07:11 AM   #6
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I was just thinking of those instances where you smell the oil in the exhaust but everything else seems ok. It's slow today I wish I brought the boxster to work, just to tinker around with it.
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Old 06-05-2015, 12:08 PM   #7
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AOS functionality tool

The old school tool was a slack tube manometer .There are several diy versions on the Forums:
Measured my crankcase vacuum...@ ~6" water - Rennlist Discussion Forums
Or you can emulate member "Ahsai" and use an electronic one:
http://www.amazon.com/Meters-PDMM01-Digital-Manometer-Measure/dp/B005FU5HFI/ref=redir_mobile_desktop/176-7096635-7269734?ie=UTF8&*Version*=1&*entries*=0
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