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Old 10-31-2017, 04:12 PM   #1
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AOS replacement fails?

New Porsche owner here. I have a 2000 Boxster 2.7 and just replaced the AOS after having some smoking during startup and periodic check engine light. All seemed to go well and I took the car out afterward and no smoke and I noticed a marked performance increase. I moved on to project number two, replacing the top, and finished that this weekend. After finishing the top I started the car and lots of smoke billowed out, more than I had before and constant with no let up. I shut the car off and decided to walk away for a bit. My question is; How likely is a failure of the new AOS that quickly? I bought the part from E-bay but it was supposed to be Porsche oem. Has anybody had a similiar experience or any advice as I go in for a second look. Any help is appreciated.

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Old 10-31-2017, 04:14 PM   #2
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New Porsche owner here. I have a 2000 Boxster 2.7 and just replaced the AOS after having some smoking during startup and periodic check engine light. All seemed to go well and I took the car out afterward and no smoke and I noticed a marked performance increase. I moved on to project number two, replacing the top, and finished that this weekend. After finishing the top I started the car and lots of smoke billowed out, more than I had before and constant with no let up. I shut the car off and decided to walk away for a bit. My question is; How likely is a failure of the new AOS that quickly? I bought the part from E-bay but it was supposed to be Porsche oem. Has anybody had a similiar experience or any advice as I go in for a second look. Any help is appreciated.
A more common issue than you might imagine. I would bet the flea bay "OEM" unit was actually aftermarket, which has very high incidents of quick failures,
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Old 10-31-2017, 04:16 PM   #3
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Its happened before...

New AOS failing?

Again AOS failure

Another failed AOS!
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Old 10-31-2017, 06:12 PM   #4
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Thanks for the replies, I guess the bad is on me, I have had other issues with ebay parts on other vehicles so I should have known. I dont look forward to replacing that one again. Any suggestions for a good parts vendor?
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Old 10-31-2017, 07:14 PM   #5
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An essential tool imho to buy when you do an AOS R&R is a Digital Manometer. Check out Pyle on Amazon . They are cheap and easy to use from the driver's seat.
Just test the old unit, then the new one.If in future you suspect AOS failure a quick, easy test gives a definitive,easy to read result that you can share here.
I had what I thought was a marginal AOS, replaced it and thought it was a dud. The Manometer test indicated it was good. The real cause of the dense smoke when cold was a leaking injector that was gradually deteriorating ! If I had let it get hotter, the next stage would have been flames !
That was a good example of the value of a $20 ,dedicated diagnostic tool and some helpful tech advice from Renntech.

Last edited by Gelbster; 11-01-2017 at 07:20 PM.
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Old 11-01-2017, 05:06 AM   #6
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It is quite normal for any boxer engine to briefly smoke after a cold start. The longer the car has sat, the more smoke. So a little smoke at cold start is not a cause for concern.

The time to worry is when you get smoke after a warm start or while driving.

As the previous response said, get a manometer and measure the crank vacuum.
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Old 11-02-2017, 05:16 PM   #7
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Any suggestions for a good parts vendor?
You might want to try the owner of the 986Forum, Pelican Parts.

This page has the Porsche OEM part: 2000 Porsche Boxster Base Convertible - Oil Circulation - Page 6
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Last edited by thstone; 11-02-2017 at 05:19 PM.
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Old 11-02-2017, 06:11 PM   #8
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Thanks for the replies, I guess the bad is on me, I have had other issues with ebay parts on other vehicles so I should have known. I dont look forward to replacing that one again. Any suggestions for a good parts vendor?
Parts you buy from a authorized Porsche dealer are warrantied for 2 years.

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