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Beej160
Spa-Francorchamps


Joined: 29 Nov 2014
Posts: 275
Location: Cambridge, United Kingdom


PostPosted: Tue Jun 27, 2017 2:07 pm    Post subject: Massive white smoke - AOS or bore scoring? Reply with quote

Hi guys

I need your help.
Driving along on Sunday and massive white smoke appears out of both exhausts. Smells of oil although looks a lot like steam.

Pull over, towed home, now deciding on what it is where to send it to.

Started engine and tried to pull oil cap off, impossible. Stopped then unscrewed oil cap, started engine and only feel a slight vacuum.

Engine sounds OK to me. What do you think it could be?

Cheers
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Martin996RSR
Silverstone


Joined: 08 Dec 2016
Posts: 100



PostPosted: Tue Jun 27, 2017 2:35 pm    Post subject: Reply with quote

That's AOS, and exactly the same symptoms I had when mine went. Don't run the engine any more until it's fixed as the oil is getting sucked out of your sump and into your inlet tract in massive quantities. It can be enough to hydraulically lock a piston and bend a con-rod and you'll be into major expense if that happens.

Pay a Porsche indie to replace it for you unless you're a masochist with the arms of a four year old.
 
  
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GT4
Nordschleife
Nordschleife


Joined: 08 Nov 2008
Posts: 30191
Location: Hertfordshire and Hampshire


PostPosted: Tue Jun 27, 2017 2:36 pm    Post subject: Reply with quote

What is the state of the coolant header tank contents?
 
  
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Beej160
Spa-Francorchamps


Joined: 29 Nov 2014
Posts: 275
Location: Cambridge, United Kingdom


PostPosted: Tue Jun 27, 2017 3:12 pm    Post subject: Reply with quote

Thanks Martin, I suspected the AOS too.
Anyone else out there who thinks it's something else?

GT4 - the coolant looks fine and at the correct level.
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Demort
Paul Ricard


Joined: 21 Mar 2015
Posts: 3250
Location: Sussex


PostPosted: Tue Jun 27, 2017 7:32 pm    Post subject: Reply with quote

Martin996RSR wrote:
That's AOS, and exactly the same symptoms I had when mine went. Don't run the engine any more until it's fixed as the oil is getting sucked out of your sump and into your inlet tract in massive quantities. It can be enough to hydraulically lock a piston and bend a con-rod and you'll be into major expense if that happens.

Pay a Porsche indie to replace it for you unless you're a masochist with the arms of a four year old.


Agree

I have actually seen a Boxster hydraulic because of a failed AOS .. VERY messy !!
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IanG1
Newbie


Joined: 08 Jan 2016
Posts: 30



PostPosted: Tue Jun 27, 2017 8:33 pm    Post subject: Reply with quote

Definitely sounds like the AOS, had similar symptoms on my boxster before I changed it out. Make sure you clean out all the intake and the throttle body. I changed my AOS but didn't do this and it continued to smoke and after going back in and stripping the intake I could see why it was full of oil. Cleaned out and no more smoke.
 
  
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Beej160
Spa-Francorchamps


Joined: 29 Nov 2014
Posts: 275
Location: Cambridge, United Kingdom


PostPosted: Tue Jun 27, 2017 9:49 pm    Post subject: Reply with quote

Thanks for the replies guys. I've booked it in with my indy, will be a few weeks before he can see it so will update with the result.

Cheers!
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Halcyon
Montreal


Joined: 02 Nov 2015
Posts: 591
Location: Somerset


PostPosted: Wed Jun 28, 2017 3:57 pm    Post subject: Reply with quote

bring fat wallet.. It's pretty much an engine out job for the 'tip Sad
Unless you know Mr Tickle Hand
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Beej160
Spa-Francorchamps


Joined: 29 Nov 2014
Posts: 275
Location: Cambridge, United Kingdom


PostPosted: Wed Jun 28, 2017 4:17 pm    Post subject: Reply with quote

Lol, the fat wallet is soon going on a crash diet!
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Beej160
Spa-Francorchamps


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Posts: 275
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PostPosted: Fri Jul 14, 2017 9:01 pm    Post subject: Reply with quote

So £750 lighter, the AOS is replaced and all is well!
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Marky911
Österreich


Joined: 04 Jun 2009
Posts: 936



PostPosted: Fri Jul 14, 2017 9:40 pm    Post subject: Reply with quote

Good result. Bit of a bill but could be worse. Thumb
 
  
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Beej160
Spa-Francorchamps


Joined: 29 Nov 2014
Posts: 275
Location: Cambridge, United Kingdom


PostPosted: Fri Jul 14, 2017 9:51 pm    Post subject: Reply with quote

It was all worth it, driving back home Smile
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nigel99
Suzuka


Joined: 16 Jul 2015
Posts: 1109
Location: Surrey

2009 Porsche 997 Carrera 2S

PostPosted: Sat Jul 15, 2017 12:14 pm    Post subject: Reply with quote

Marky911 wrote:
Good result. Bit of a bill but could be worse. Thumb


It's funny really that we think any bill less than a grand is getting away with it! What a lucky bunch we are.

Glad the cars sorted.
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Beej160
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Joined: 29 Nov 2014
Posts: 275
Location: Cambridge, United Kingdom


PostPosted: Sat Jul 15, 2017 12:17 pm    Post subject: Reply with quote

My implication was that once I got back behind the wheel again after 2 weeks off the road, the pleasure it gave me was worth the pain, even as that bill was pretty painful, trust me!
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