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Self healing AOS?

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Old Mar 1, 2020 | 07:54 PM
  #1  
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Default Self healing AOS?

So I have an electronic manometer and have been monitoring my AOS every few months.
The first few times I tested it was well under 5”H2O.
Then the next time it read a little under 7”.
Someone suggested I change the battery and retest.
Last time, after a new battery was installed, was back in November of last year and it reached nearly 9”.
I’ve been putting replacement off, and then decided I’d wait for @Porschetech3 ’s UAOS.
When I tested it on Friday after a 35 mile commute, it read 4.94”.
I’m going to retest after my commute tomorrow.

What could cause an AOS to fail, and then un-fail?
Maybe I need to test the old fashioned way with a slack tube.
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Old Mar 2, 2020 | 03:06 AM
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Mine failing cost me the engine.. Ya takes your chances..
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Old Mar 2, 2020 | 10:47 AM
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Cars don't heal themselves. If you AOS showed signs of failing, it will not magically fix itself. I fit happened ones, it will happen again. Your car is trying to tell you something, make sure you listen.
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Old Mar 2, 2020 | 10:51 AM
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Did you test under identical conditions? I.e. the same amount of driving and everything up to temp?
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Old Mar 2, 2020 | 11:04 AM
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Mine is (Scott caught me again) all over the place and I'm not sure if my Manometer is even working properly.

Last edited by 808Bill; Mar 2, 2020 at 12:41 PM.
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Old Mar 2, 2020 | 11:36 AM
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Maybe you have an intermittent vacuum leak somewhere else in the system that causes erratic readings ??
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Old Mar 2, 2020 | 11:38 AM
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Originally Posted by 808Bill
Mines all over the place and I'm not sure if my Manometer is even working properly.
I had to read this a couple of times. This is what came to mind, first...


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Old Mar 2, 2020 | 11:39 AM
  #8  
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Originally Posted by Coopduc
Maybe you have an intermittent vacuum leak somewhere else in the system that causes erratic readings ??
There you go, using rational thought.
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Old Mar 2, 2020 | 11:41 AM
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Originally Posted by 808Bill
Mines all over the place and I'm not sure if my Manometer is even working properly.
Maybe you should try a Ladyometer... it may treat you better
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Old Mar 2, 2020 | 11:51 AM
  #10  
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Originally Posted by Scott at Team Harco
There you go, using rational thought.
I hate it when that happens. I’ll go back to jackass mode now.

Originally Posted by 808Bill
Mines all over the place and I'm not sure if my Manometer is even working properly.
There are little blue pills that can help with that...I mean I’ve been told!
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Old Mar 2, 2020 | 11:53 AM
  #11  
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Originally Posted by Coopduc
I hate it when that happens. I’ll go back to jackass mode now.
Don't try to muscle in on my territory.
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Old Mar 2, 2020 | 12:13 PM
  #12  
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I agree that an intermittent issue would be more likely than self healing. Hopefully @Porschetech3 could chime in, or you could bring it up in his AOS Solution thread.
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Old Mar 2, 2020 | 12:28 PM
  #13  
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Originally Posted by Scott at Team Harco
I had to read this a couple of times. This is what came to mind, first...

Yup, the m96 is loaded with mines!
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Old Mar 2, 2020 | 12:30 PM
  #14  
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Originally Posted by Coopduc
Maybe you have an intermittent vacuum leak somewhere else in the system that causes erratic readings ??
That crossed my mind (see that Scott). Might be the old oil fill cap I used.
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Old Mar 2, 2020 | 12:30 PM
  #15  
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Originally Posted by 808Bill
Yup, the m96 is loaded with mines!
Or if you are accessing the site on your phone and using the tiny little "keypad", inserting an apostrophe is a pain in the ***.
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