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Bonners
Newbie


Joined: 02 Jun 2008
Posts: 45



PostPosted: Wed Jun 04, 2008 9:37 pm    Post subject: Burning Oil Reply with quote

I have a C4S 2006, in warranty !

I understand that they use oil but, mine smokes a bit on start and also when slowing down then "booting" at, say, a roundabout.

Anyone with similar experience ?

The strange thing is that the left side exhaust is "blackened" whilst the right side is not. It's almost like it's running rich on one side only !!!

Any ideas ?
 
  
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ResB
Estoril


Joined: 30 Jan 2008
Posts: 3708
Location: North Yorkshire

2006 Porsche 997 Carrera 2S

PostPosted: Wed Jun 04, 2008 10:08 pm    Post subject: Reply with quote

How many miles has it done?

I'd get it checked by a dealer. Something not right. A bit of smoke when you start it for the first time is not uncommon.
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Bonners
Newbie


Joined: 02 Jun 2008
Posts: 45



PostPosted: Wed Jun 04, 2008 10:10 pm    Post subject: Reply with quote

It's done 33K, possibly a breather blocked ?
 
  
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ResB
Estoril


Joined: 30 Jan 2008
Posts: 3708
Location: North Yorkshire

2006 Porsche 997 Carrera 2S

PostPosted: Wed Jun 04, 2008 11:38 pm    Post subject: Reply with quote

Bonners wrote:
It's done 33K, possibly a breather blocked ?


Yeah, could be, or a sticking valve perhaps. Mine has done 32k and I sometimes get a bit of smoke when I first fire up after the car has been stood all night in the garage. The garage is on a slight slope also, so I don't know if this is one of the reasons for this.
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Bonners
Newbie


Joined: 02 Jun 2008
Posts: 45



PostPosted: Thu Jun 05, 2008 10:31 am    Post subject: Reply with quote

I think breather is favourite, I'll book it in and see what they say !

Thanks for your advice
 
  
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Big Bob
Barcelona


Joined: 23 Jan 2008
Posts: 1348
Location: Southampton


PostPosted: Thu Jun 05, 2008 1:39 pm    Post subject: Reply with quote

The description is the normal consequence of being on engine overun which tends to draw oil down the inlet valve guides in particular, as the engine is sucking at the intake but the throttle valves are shut.
When you put your foot back down this then burns the oil off.
If the valve checks out OK, then talk to them about your Valve Seals being worn, just to get it noted just in case etc.
Regards Big Bob
 
  
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KevinK
Newbie


Joined: 02 Jun 2008
Posts: 4



PostPosted: Thu Jun 05, 2008 1:52 pm    Post subject: Reply with quote

Hi, This really does sound like valve seals, as engine is burning off oil. I have a 2006 997 C2S (12000 miles) and it burns about 1 litre every 4000 miles. Hope this helps. Kev.
 



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abcheetham
Hockenheim


Joined: 01 Jan 2008
Posts: 687
Location: West Yorkshire


PostPosted: Thu Jun 05, 2008 6:09 pm    Post subject: also when slowing down then "booting" at, say, a r Reply with quote

I have exactly this issue with my car although it's a 996. It has totally mistified my local indy who despite being out with me and seeing it and having it in on 4 seperate occasions can't find a reason for it. Like you it's one exhaust, only when booitng it and most likely when slowing down and booting it round a bend or out of a bend. car runs fine though apart form that though! frustrated
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Andy
997 C4S GT3 Aerokit
Smart Fortwo
Volvo XC60 R Design (for kids, dog, horse stuff and everything else!)
Specialized S Works Mountain bike (for the odd sunny commute)
 
  
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Big Bob
Barcelona


Joined: 23 Jan 2008
Posts: 1348
Location: Southampton


PostPosted: Thu Jun 05, 2008 7:17 pm    Post subject: Reply with quote

Sadly while many mechanics are trained in how to repair items,
they often have not experienced the engineering dynamics of engines, and how they behave.
Sorry about that but it is the product of being an old git
Regards Big Bob bye Old
 
  
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abcheetham
Hockenheim


Joined: 01 Jan 2008
Posts: 687
Location: West Yorkshire


PostPosted: Thu Jun 05, 2008 8:11 pm    Post subject: Reply with quote

you cant beat experience !
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Andy
997 C4S GT3 Aerokit
Smart Fortwo
Volvo XC60 R Design (for kids, dog, horse stuff and everything else!)
Specialized S Works Mountain bike (for the odd sunny commute)
 
  
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Jeff
Indianapolis


Joined: 30 Aug 2007
Posts: 2377
Location: Chavley South South


PostPosted: Thu Jun 05, 2008 8:17 pm    Post subject: Reply with quote

Big Bob wrote:
Sadly while many mechanics are trained in how to repair items,
they often have not experienced the engineering dynamics of engines, and how they behave.
Sorry about that but it is the product of being an old git
Regards Big Bob bye Old


Valve stem seals, common repair on Mitsubishi's at anything from 60k miles.... To do this without stripping down the engine it was simply a case of drilling out a spark plug, fitting an air fitting, screwing it into the spark plug hole, putting 100psi into the cylinder which keeps the valves from falling in when you undo the valve spring to change the stem seal....
Simple! Smile
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Bonners
Newbie


Joined: 02 Jun 2008
Posts: 45



PostPosted: Fri Jun 06, 2008 11:32 am    Post subject: Reply with quote

Thanks for that men

It's booked in OPC next wednesday, I'll report back subsequently

Bonners
 
  
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