10-31-2017, 03:12 PM
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#1
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Lvsranch
Join Date: Jul 2016
Location: Sarasota Fla.
Posts: 10
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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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10-31-2017, 03:14 PM
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#2
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Registered User
Join Date: Feb 2005
Location: It's a kind of magic.....
Posts: 6,556
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Quote:
Originally Posted by lvsranch
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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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,
__________________
“Anything really new is invented only in one’s youth. Later, one becomes more experienced, more famous – and more stupid.” - Albert Einstein
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10-31-2017, 03:16 PM
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#3
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Certified Boxster Addict
Join Date: Nov 2010
Location: Los Angeles
Posts: 7,669
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__________________
1999 996 C2 - sold - bought back - sold for more
1997 Spec Boxster BSR #254
1979 911 SC
POC Licensed DE/TT Instructor
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10-31-2017, 05:12 PM
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#4
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Lvsranch
Join Date: Jul 2016
Location: Sarasota Fla.
Posts: 10
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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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10-31-2017, 06:14 PM
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#5
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Registered User
Join Date: May 2014
Location: S.California
Posts: 2,029
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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 06:20 PM.
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11-01-2017, 04:06 AM
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#6
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Registered User
Join Date: Sep 2016
Location: Stow, MA
Posts: 918
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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.
__________________
2004 Boxster S Silver - FUNTOY
2002 Boxster Base Guardsy Red - FUNBOX
1987 Caterham Super 7 1700 Supersprint
2009 Mercedes Benz CLK 350 convertible
1941 Dodge Luxury Liner Coupe
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11-02-2017, 04:16 PM
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#7
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Certified Boxster Addict
Join Date: Nov 2010
Location: Los Angeles
Posts: 7,669
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Quote:
Originally Posted by lvsranch
Any suggestions for a good parts vendor?
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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
__________________
1999 996 C2 - sold - bought back - sold for more
1997 Spec Boxster BSR #254
1979 911 SC
POC Licensed DE/TT Instructor
Last edited by thstone; 11-02-2017 at 04:19 PM.
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11-02-2017, 05:11 PM
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#8
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Registered User
Join Date: Oct 2008
Location: O.C. CA
Posts: 3,709
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Quote:
Originally Posted by lvsranch
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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Parts you buy from a authorized Porsche dealer are warrantied for 2 years.
__________________
OE engine rebuilt,3.6 litre LN Engineering billet sleeves,triple row IMSB,LN rods. Deep sump oil pan with DT40 oil.
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