Posted: Tue Jun 13, 2017 6:57 pm Post subject: smoking bad
I've had my porsche 3 years not done many miles as I've been doing it up .... but now I've finished .. took the car out other day and had to stop due to what I can only say is looked like car was on fire .. smoking like a steam train . a burning oil smell gutted isn't the word ... when I bought the car the guy had lots of money spent on the engine . now I haven't a clue what's up with it called the aa and he said not touching it as it's a porsche . started it other day seam ok went around the block 5 min and started again ...any ideas
wassy78 Silverstone
Joined: 28 Aug 2014 Posts: 121
Posted: Tue Jun 13, 2017 7:00 pm Post subject:
just to add it's a carrea 4 2001 . not been driven in a while only started up now and then ... had a oil change ... oil level is ok not over fill
Demort Paul Ricard
Joined: 21 Mar 2015 Posts: 3105 Location: Sussex
Posted: Tue Jun 13, 2017 7:09 pm Post subject:
Is it from 1 exhaust pipe or both ? both and it could be the AOS .. 1 and thats not good as it indicates coolant .
Colour of smoke ? _________________
7pm - 9pm
wassy78 Silverstone
Joined: 28 Aug 2014 Posts: 121
Posted: Tue Jun 13, 2017 7:13 pm Post subject:
I've watch u tube videos about aos and that's the colour of smoke and the amount of smoke . no water loss or oil . but from the device cat pipes looks like oil dripping
wassy78 Silverstone
Joined: 28 Aug 2014 Posts: 121
Posted: Tue Jun 13, 2017 7:14 pm Post subject:
joins of de cat pipes was meant to say blooming phone lol
Demort Paul Ricard
Joined: 21 Mar 2015 Posts: 3105 Location: Sussex
Posted: Tue Jun 13, 2017 8:39 pm Post subject:
Both pipes and the AOS is the most obvious fault here .. smoke will be grey ish white ish in colour .
If its a tiptronic then its engine out .. if a manual then you might be ok doing it in situe . _________________
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Martin996RSR Trainee
Joined: 08 Dec 2016 Posts: 96
Posted: Wed Jun 14, 2017 8:26 am Post subject:
I had this with mine last year. It's almost certainly the AOS. Don't drive it again until it's been fixed.
The white smoke is evaporated (rather than burnt) smoke coming through the engine via the inlet manifold. The volumes of it are very large, meaning most of it isn't burned, it's just turned into vapour (100% burned oil produces grey smoke). The part of the AOS that fails that allows this to happen is a rubber diaphragm that perishes and fails, allowing engine inlet manifold vacuum to suck the oil out of the sump.
The reason you shouldn't drive is that the very large amount of oil that can find its way into the engine is sufficient to hydraulically lock a piston. I know this because when I pulled my plugs after mine failed I had two cylinders with a mugfull of oil in each of them. I was very lucky not to have bent a con-rod.
It's a total pig of a job to replace DIY, even if you are very handy with the spanners, because of its location on the top/front of the engine, right at the back of the engine bay. Find a Porsche specialist who is willing to do it for £800 and you're golden.
wassy78 Silverstone
Joined: 28 Aug 2014 Posts: 121
Posted: Wed Jun 14, 2017 2:25 pm Post subject:
I've booked it in for the aos to be done thanks all and a ceramic bearing ims I think it's called might as well if engine coming out
Martin996RSR Trainee
Joined: 08 Dec 2016 Posts: 96
Posted: Wed Jun 14, 2017 2:45 pm Post subject:
You may wish to question the ceramic bearing IMS. A standard IMS bearing with the engine side dust cover removed to allow oil in and debris out is now considered better. The ceramic ball bearings are too hard and the bearing races fail because the balls beat pits into them.
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