Go Back   986 Forum - for Porsche Boxster & Cayman Owners > Porsche Boxster & Cayman Forums > Boxster General Discussions

Reply
 
LinkBack Thread Tools Display Modes
Old 08-07-2019, 08:56 PM   #1
Registered User
 
Join Date: May 2017
Location: Gilbert, Arizona
Posts: 11
Oil leaking from exhaust

I had some time tonight to get under my cheap Porsche Boxster to look and see what could be wrong. I have a video of me buying the car on my Youtube, in which you can see the white smoke (AOS I am sure) and the loud knocking; I was expecting to see a hole in the bottom of the case. However, I found oil leaking out of the exhaust flange on both sides, I just posted a short video of how bad the oil leaking out is.

I tried running a search online for this issue but didn't see much on it. Lots on the white smoke from the AOS, but not oil dripping out from the exhaust flange. My first thought is the plastic spark plug tubes are shot; a new AOS and new spark plug tubes might fix the oil in the exhaust... but could the fact that the exhaust system is bearly holding on be the loud knocking noise?

Ideas?

Here is the link to the video of the oil dripping out.
https://youtu.be/v8YfelE6Pg0

Thanks,

Brian

Brian Minson is offline   Reply With Quote
Old 08-08-2019, 02:49 PM   #2
Registered User
 
Join Date: Aug 2019
Location: Texas
Posts: 99
Get ready for an engine rebuild. That is not the AOS.
Fiddlebog is offline   Reply With Quote
Old 08-08-2019, 03:16 PM   #3
Who's askin'?
 
maytag's Avatar
 
Join Date: Mar 2018
Location: Utah
Posts: 1,471
If the AOS is bad enough, then you could fill the exhaust system with oil being pumped through the motor. Ask me how I know. But you'll notice the motor running rough at that stage.

Here's how my thought-flow would look:

Does it run well, even at High RPM?
Does it blow MORE white smoke or LESS when you rev the motor?
Does it leak MORE oil from the exhaust, or LESS when you rev the motor.
Does the loud knocking go away when you grab ahold of the exhaust (USE A GLOVE!) and put tension on it?
Does the knocking noise at any time go away?


Answer those for me, we'll help dial ya in a little bit.

Quote:
Originally Posted by Brian Minson View Post
I had some time tonight to get under my cheap Porsche Boxster to look and see what could be wrong. I have a video of me buying the car on my Youtube, in which you can see the white smoke (AOS I am sure) and the loud knocking; I was expecting to see a hole in the bottom of the case. However, I found oil leaking out of the exhaust flange on both sides, I just posted a short video of how bad the oil leaking out is.

I tried running a search online for this issue but didn't see much on it. Lots on the white smoke from the AOS, but not oil dripping out from the exhaust flange. My first thought is the plastic spark plug tubes are shot; a new AOS and new spark plug tubes might fix the oil in the exhaust... but could the fact that the exhaust system is bearly holding on be the loud knocking noise?

Ideas?

Here is the link to the video of the oil dripping out.
https://youtu.be/v8YfelE6Pg0

Thanks,

Brian
maytag is offline   Reply With Quote
Old 08-08-2019, 09:39 PM   #4
Certified Boxster Addict
 
Join Date: Nov 2010
Location: Los Angeles
Posts: 7,518
IF (and that is a big IF) the cause is the AOS, then I would say that you need to stop running the engine. With that much oil flowing through the combustion chambers there is a good risk of hydrolocking the engine (oil is non-compressible) and causing permanent damage.

If it was me, I'd replace the AOS (whether it's the cause or not, its the place to start) and clean the oil out of the air intake and exhaust. With that much oil in the intake and exhaust, it will take forever to burn out so it needs to be manually cleaned out. I also worry that the cat's may have already been damaged from that much oil.

Then start it up and let it run for a bit. You're likely to still get some white smoke but it should diminish. If all goes well, you're done. If not, you're just starting...
__________________
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; 08-08-2019 at 09:49 PM.
thstone is offline   Reply With Quote
Old 08-11-2019, 10:00 AM   #5
Registered User
 
Join Date: Dec 2009
Location: Orange County, CA
Posts: 1,272
Quote:
Originally Posted by thstone View Post
IF (and that is a big IF) the cause is the AOS, then I would say that you need to stop running the engine. With that much oil flowing through the combustion chambers there is a good risk of hydrolocking the engine (oil is non-compressible) and causing permanent damage.
...
Perhaps be a good idea to remove all the spark plugs and crank the engine to remove the excess oil..
Gilles is offline   Reply With Quote
Old 08-11-2019, 10:21 AM   #6
1998 Boxster Silver/Red
 
Join Date: Sep 2017
Location: 92262
Posts: 1,448
Quote:
Originally Posted by Gilles View Post
Perhaps be a good idea to remove all the spark plugs and crank the engine to remove the excess oil..
That,,, and remove the fuel pump fuse beforehand.
__________________
1998 Porsche Boxster
1986 BMW 325es
2012 Ford Edge Sport

"Ignore the guilt, and take your turn"
Starter986 is offline   Reply With Quote
Old 08-12-2019, 11:42 AM   #7
Certified Boxster Addict
 
Join Date: Nov 2010
Location: Los Angeles
Posts: 7,518
Quote:
Originally Posted by Gilles View Post
Perhaps be a good idea to remove all the spark plugs and crank the engine to remove the excess oil..
You're absolutely correct! I missed that step, thanks for mentioning it.

__________________
1999 996 C2 - sold - bought back - sold for more
1997 Spec Boxster BSR #254
1979 911 SC
POC Licensed DE/TT Instructor
thstone is offline   Reply With Quote
Reply


Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are On




All times are GMT -8. The time now is 05:01 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
Content Relevant URLs by vBSEO 3.6.0
Copyright 2018 Pelican Parts, LLC - Posts may be archived for display on the Pelican Parts Website -    DMCA Registered Agent Contact Page