Tom163 Posted January 2, 2020 Report Share Posted January 2, 2020 Hey guys, I know this is a age old questions asked thousands of times and even with owning a 986 before this one I can’t seem to be confident if this is normal or a possible AOS on its way out. Any opinions are really welcomed. I pretty much get some kind of smoke on every cold start but a bit worse when left overnight as to be expected. Just the fact it’s each morning and it doesn’t feel correct being each morning. The below 3 videos are when I started it from cold after sitting overnight at around 1pm in the afternoon so not freezing temps, more around 6c. They are in order of start and then letting it idle before moving it into garage. Also not sure if it makes any difference but does have a DesignTek valvetronic exhaust. Thanks! Link to comment Share on other sites More sharing options...
Liberty Posted January 2, 2020 Report Share Posted January 2, 2020 Someone correct me if I’m wrong but if you take the oil cap off and you get vacuum the AOS is faulty but if not then it should be okay? Link to comment Share on other sites More sharing options...
sa utah Posted January 2, 2020 Report Share Posted January 2, 2020 I’d say definitely a bad AOS. It even sounds just like my 2.7 did when I bought it with a bad AOS After changing it you’ll live the lack of smoke screen but will be disappointed at the lack of noise ! Link to comment Share on other sites More sharing options...
Davey P Posted January 2, 2020 Report Share Posted January 2, 2020 Mine looks similar on start up, and it was a bit disconcerting at first. However, after reading a few threads on here I'm assuming it's normal for the flat 6 engine, and nothing to worry about. I've got the car booked in to TWG on Tuesday for a couple of things, so I'm going to ask them about it anyway. I think I can guess what they will say.... Link to comment Share on other sites More sharing options...
Tom163 Posted January 2, 2020 Author Report Share Posted January 2, 2020 2 hours ago, Liberty said: Someone correct me if I’m wrong but if you take the oil cap off and you get vacuum the AOS is faulty but if not then it should be okay? I am able to remove the oil cap when hot or cold engine but there is a sucking vaccum kind of noise when I do. I believe it’s when the cap can’t be removed by hand at all its fully knackered? 2 hours ago, sa utah said: I’d say definitely a bad AOS. It even sounds just like my 2.7 did when I bought it with a bad AOS After changing it you’ll live the lack of smoke screen but will be disappointed at the lack of noise ! That maybe just the really loud sports exhaust your heating mate 😅 unless your detecting something behind the loudness?? 2 hours ago, Davey P said: Mine looks similar on start up, and it was a bit disconcerting at first. However, after reading a few threads on here I'm assuming it's normal for the flat 6 engine, and nothing to worry about. I've got the car booked in to TWG on Tuesday for a couple of things, so I'm going to ask them about it anyway. I think I can guess what they will say.... Yeah for sure. I don’t remember the old 986 doing it so much and it’s more worried me as it’s every cold engine start lately. The smoke definite has an oily smell but guessing it’s mixed in with water vapour too from the exhaust. Please let me know what TWG say buddy. Link to comment Share on other sites More sharing options...
Davey P Posted January 2, 2020 Report Share Posted January 2, 2020 21 minutes ago, Tom163 said: Please let me know what TWG say buddy. Will do mate Link to comment Share on other sites More sharing options...
DaveEFI Posted January 3, 2020 Report Share Posted January 3, 2020 When mine does it - only once in a while - it is a big cloud of obviously blue smoke which clears quickly. But it always 'steams' - white smoke - on every cold start on a cold damp day. And that steam will continue until the exhaust heats up fully. That video looks like steam. Link to comment Share on other sites More sharing options...
rhys57 Posted January 5, 2020 Report Share Posted January 5, 2020 Mine does this don't worry if it does it all the time it's the aos of is just now and then it's normal Link to comment Share on other sites More sharing options...
Liberty Posted January 6, 2020 Report Share Posted January 6, 2020 The car wizard says crankcase vent valve needs replacing?? Link to comment Share on other sites More sharing options...
Nobbie Posted January 6, 2020 Report Share Posted January 6, 2020 3 minutes ago, Liberty said: The car wizard says crankcase vent valve needs replacing?? Isn't that just another name for the AOS? Link to comment Share on other sites More sharing options...
Liberty Posted January 6, 2020 Report Share Posted January 6, 2020 13 minutes ago, Nobbie said: Isn't that just another name for the AOS? Could be..was wondering as he showed or rather pointed at something that didn’t look like the AOS. Link to comment Share on other sites More sharing options...
kevin450 Posted January 6, 2020 Report Share Posted January 6, 2020 I’ve just replaced my aos had the same symptoms with white smoke on start since aos replaced no smoke on start. I also cleaned the throttle body and intake manifold where I found oil sitting in the intake by the flap which I hope is a sign of a bad aos going to check again after a good few miles. Would appreciate comments on oil in the intake manifold area that it is a sign of a bad aos Link to comment Share on other sites More sharing options...
sa utah Posted January 6, 2020 Report Share Posted January 6, 2020 I did the same as you as per my previous post. Oil in the intake is a sign of a bad AOS I took out all the intake hoses etc and cleaned them. It’s one of the first thing I’d look for and replace if I got another 987 or similar. Wasn’t that difficult to do with the correct tools so for 70 quid or thereabouts it’s sorted. They only get worse so better to catch it early I’d say Link to comment Share on other sites More sharing options...
kevin450 Posted January 6, 2020 Report Share Posted January 6, 2020 Thanks for reply yes agree right tool for the hose clamps required my local Indy for the aos was a great price Link to comment Share on other sites More sharing options...
John K Posted January 30, 2020 Report Share Posted January 30, 2020 Yesterday I got my first (that I know of) blue cloud After a 5 day lay up I started it yesterday and there was just the right sort of breeze to blow a small puff of blue smoke past the car It cleared in 2 to 3 seconds and didn't do it when I restarted to car to come home an hour later I'll keep an eye on the oil level and see if it does again At the mo I'm not "worried" as I'm putting it down to a bit of residual oil, but if a pattern develops I'll come back... Link to comment Share on other sites More sharing options...
Araf Posted January 31, 2020 Report Share Posted January 31, 2020 In two of the videos there's as much 'smoke' coming from around the exhaust as there is through it, which would lead me to think it is more of a condensation problem and perfectly normal. It positively billows out, if you have an AOS problem. Link to comment Share on other sites More sharing options...
rhys57 Posted February 2, 2020 Report Share Posted February 2, 2020 Just to let you know mine did this, I had the aos changed and its stopped doing it now, no smoke on start up Link to comment Share on other sites More sharing options...
bally4563 Posted February 2, 2020 Report Share Posted February 2, 2020 Just replace it ,and then go and worry about something else, like non N rated tyres for example!! Link to comment Share on other sites More sharing options...
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