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Old 03-01-2020, 06:22 PM   #1
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New AOS same problem

I installed my new porsche direct AOS unit and still have the sucking sound,..if I plug intake and AOS tube connections, No more sucking sound ,..Can you vacuum test the AOS.. plus all codes still the same aswell..Bummer,..So I guess fuel presure test and then smoke that babie I guess.? right Thanks Frank

Codes: P0300,..,04,05,06 and a P1238 secondary fuel system ??

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Old 03-02-2020, 01:56 AM   #2
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You can test the AOS by replacing the oil fill cap with a test cap hooked up to a digital manometer. Fully warmed up, you should see no more than 5 inches of water vacuum signal.
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Old 03-02-2020, 05:10 AM   #3
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You can test the AOS by replacing the oil fill cap with a test cap hooked up to a digital manometer. Fully warmed up, you should see no more than 5 inches of water vacuum signal.
Source/link? This is news to me and I would love to check it out.
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Old 03-02-2020, 06:51 AM   #4
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Source/link? This is news to me and I would love to check it out.

Been around for years...………….

https://www.youtube.com/watch?v=t95lNYp2plc
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Old 03-02-2020, 07:02 AM   #5
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Ahh ok...But the Idle does lower when I pull the oil filler cap,..Thanks !
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Old 03-02-2020, 07:09 AM   #6
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Ahh ok...But the Idle does lower when I pull the oil filler cap,..Thanks !
So does a marginally bad AOS. The manometer gives you a simple way to test the vacuum signal and even catches units just starting going south. We check every car going through the shop, regardless of why it is here, 5.0 or less and you are golden; over 5 and you need an AOS. Testing regime has cut back dramatically on catastrophic AOS failures.
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Old 03-02-2020, 07:36 AM   #7
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I installed my new porsche direct AOS unit and still have the sucking sound,..if I plug intake and AOS tube connections, No more sucking sound ,..Can you vacuum test the AOS.. plus all codes still the same aswell..Bummer,..So I guess fuel presure test and then smoke that babie I guess.? right Thanks Frank

Codes: P0300,..,04,05,06 and a P1238 secondary fuel system ??

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Old 03-02-2020, 07:40 AM   #8
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That's good news Byprodriver,..JFP,..whats a decent (cheapie) Manometer to get,and is it a common item to get around town,? Thanks once again guys..Frank
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Old 03-02-2020, 09:36 AM   #9
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That's good news Byprodriver,..JFP,..whats a decent (cheapie) Manometer to get,and is it a common item to get around town,? Thanks once again guys..Frank
I bought this one, and it's served me well.

JFP turned me onto this method of testing the AOS as well. I LOVE that he just does it on every car as a natural course of operations. Hard to find that sort of service these days. (Wish he were near me)
I've started checking mine as I'm preparing for every Track Event.
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Old 03-02-2020, 10:51 AM   #10
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Thanks for the info, y'all. This seems like a must-have for my shop.
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Old 03-04-2020, 06:34 AM   #11
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Thanks,for that tip Maytag,..its on order, so as soon as it gets here Ill do that test,.!
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Old 03-07-2020, 05:15 PM   #12
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I get the Manometer that Maytag suggested,..But Iam Not sure if I hooked it up correctly,..I set it to INH2O used the RHand prong and it shows ( - 1.47 ) cold ,.I know its suppose to be at operating Temp,.but Iam checking to see if I even hooked it up correctly,.....oil cap drilled with a brass fitting that I epoxied into place,.and then attached a 3/16 tube that was supplied..?? Thanks Frank
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Old 03-10-2020, 12:07 PM   #13
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I get the Manometer that Maytag suggested,..But Iam Not sure if I hooked it up correctly,..I set it to INH2O used the RHand prong and it shows ( - 1.47 ) cold ,.I know its suppose to be at operating Temp,.but Iam checking to see if I even hooked it up correctly,.....oil cap drilled with a brass fitting that I epoxied into place,.and then attached a 3/16 tube that was supplied..?? Thanks Frank
I've never measured cold. I can't help ya with that.

Get it warmed-up and see what reading you get. I'm typically around 3.7, fully warmed.

It really shouldn't matter which side of the manometer you hook to; one should read positive, one should read negative. You'll probably want to put a hose on the other nipple as well, though, and route it somewhere where it's protected from any wind or venting. It'll be very sensitive.

I assume you watched the video that JFP linked you to earlier?
Read this thread, for more help:
https://rennlist.com/forums/996-forum/992560-tested-my-aos-today-what-does-this-mean-2.html
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Old 03-11-2020, 07:54 AM   #14
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Yes Maytag I sure did check out the link JFP referenced,.and now the Rennlist link you showed,..Thank You,.!! Frank
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Old 03-11-2020, 08:20 AM   #15
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Now,I went to the left prong,warm at 180 Deg,and meter read's 3.18 to 3.30 fluctuating. Thanks
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Old 03-11-2020, 08:44 AM   #16
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Now,I went to the left prong,warm at 180 Deg,and meter read's 3.18 to 3.30 fluctuating. Thanks
Frank, that's not too far from what I read on mine. (I'm usually closer to 3.7)
I've taken that to mean the AOS is currently healthy. But I've only ever seen the one. JFP will have much more data behind his advice. Let's wait and see what he says.

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Old 03-11-2020, 09:16 AM   #17
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it did increase to 3.75-3.80,..but I pulled the intake to AOS hose like JFP said to check vacuum and I have oil in the top of that AOS and the connecting tube,..enough to cover the tip of my little finger twice over,..and can tap oil out of the new tube. ! So another one on the way..I sure hope this is the issue,..and I will also drain some oil to be safe now,..like Newart has suggested in another thread.!
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Old 03-11-2020, 10:03 AM   #18
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it did increase to 3.75-3.80,..but I pulled the intake to AOS hose like JFP said to check vacuum and I have oil in the top of that AOS and the connecting tube,..enough to cover the tip of my little finger twice over,..and can tap oil out of the new tube. ! So another one on the way..I sure hope this is the issue,..and I will also drain some oil to be safe now,..like Newart has suggested in another thread.!
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Old 03-11-2020, 04:19 PM   #19
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Direct from Porsche,
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Old 03-11-2020, 05:30 PM   #20
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as was the last one,..I didn't want to chance a bad unit,.Lol..

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