jaysVR6 2 Posted August 28, 2004 Report Share Posted August 28, 2004 Ok guys , here we go...My VRs only done 55k and its all verified with the main dealer s/h - although you could argue that the previous owner pulled the speedo plug on top of the gearbox everytime he did motorway miles in between services. Anyway, I had an Inspection 1 last week and everything was fine. Included in the inspection was a compression test and again this was fine, all fluid levels were also fine etc.Now my car doesn't smoke at all under acceleration be it hard or normal but if I coast down a long hill in say 3rd or 4th and floor it at the bottom it smokes for a couple of secs with the throttle wide open, (its not reving hard just building up revs) then stops smoking.The guy in the VW garage says that this is common on VRs and they do use a bit of oil and I should keep an eye on it. I asked if it was Stem seals and he says they don't usually suffer from that. It can't be rings or it would smoke under acceleration, so is my motor fucked or am I just being paronoid? Link to post Share on other sites
mightyvr6 0 Posted August 28, 2004 Report Share Posted August 28, 2004 Mine does that too (even with a brand new head on) It's because the engine breathes heavily and oil vapour is lost through the crankcase. Oil goes through the pcv valve into the intake and is burnt off leaving a trail of blue smoke (always down a hill and never under acceleration). I've disconnected the pcv valve so crankcase vapours don't go into the intake and it doesn't smoke now. I'm sure this is the cause of the problem.[ Edited Sat Aug 28 2004, 11:52PM ] Link to post Share on other sites
jcorallo 0 Posted August 28, 2004 Report Share Posted August 28, 2004 In many cases, the cause of blue smoke on VR's is due to overfueling on the over-run i.e. when going down hill with your foot off throttle.Whats actually happening, is that the ECU is putting too much fuel into the cylinders, and its washing the protective layer off the cylinder walls - cylinder washing - which is really bad as it causes wear.Mightyvr6 - you are prob seeing this as you've played about with the MAF - and the ECU thinks its sucking air into the engine and supplying the fuel for this non-existent air.....Jules Link to post Share on other sites
jcorallo 0 Posted August 28, 2004 Report Share Posted August 28, 2004 jaysVR6 - same for you - if you think all is OK, double check everything - air leaks - O2 sensors, MAF etc.As said, if the ECU thinks the engine is getting too much air, it dumps fuel.Jules[ Edited Sun Aug 29 2004, 12:52AM ] Link to post Share on other sites
mightyvr6 0 Posted August 28, 2004 Report Share Posted August 28, 2004 if its overfueling shouldn't it be black smoke? Or is it oil and petrol which cause the smoke?[ Edited Sun Aug 29 2004, 01:00AM ] Link to post Share on other sites
jcorallo 0 Posted August 29, 2004 Report Share Posted August 29, 2004 yep - the oil and petrol causes the blue smoke.look at it this way, if you leave a car running long enough with black smoke, given time and many miles, it will eventually turn blue due to wear. the excess petrol will be washing the oil film off the bores and you've got metal on metal contact.jules[ Edited Sun Aug 29 2004, 08:04PM ] Link to post Share on other sites
jaysVR6 2 Posted August 29, 2004 Author Report Share Posted August 29, 2004 Thanks for all your help guys. Thing is, what the hell do I do to stop it doing it?Would it be a good idea to take it to a tuning company? I was thinking of getting it chipped soon. Would that sort things? Link to post Share on other sites
tandino 1 Posted August 30, 2004 Report Share Posted August 30, 2004 Highly unlikely thats its due to overfuelling on the overun - if so this wouldnt be the only time you would be getting visible burning oil - you would see it on all idle/off throttle conditions - ie the same fuelling situtation....Defo either a crankcase breather problem or valve stem oil seals - vacuum is pulling the oil through.Pete. Mackenzie 1 Link to post Share on other sites
mark taylor 0 Posted August 31, 2004 Report Share Posted August 31, 2004 Mines just started smoking on overun aswell.Could it be caused by a lambda fault?? Link to post Share on other sites
Recommended Posts