I let my Mk2 warm up to temperature today, and after around 10mins or so, the exhaust would smoke when revved ? The smoke is blue and it smells quite strong. Not sure what could be causing this tbh ? I don't think it's the piston rings or valve stem seal, as it doesn't always smoke. Only when revved after idling for a while. Turbo is in good condition too. I've heard a dodgy PCV valve can cause blue smoke. The Mk2 hasn't been driven for a while. Maybe it needs a good blast perhaps ? Anyone know what may be causing this ? Cheers. Rich.
My VR6 did this when I vented the rocker cover to a little filter, the hose I used heated and flattened, I hope it's something equally as simple on yours.
I hope so Ian. Can't deal with any major problems again I've ruled out valve stem seals and piston rings, as it doesn't do it on start up. Something simple hopefully. Going to re-check all the boost piping and the PCV system, and I might drop the oil again, even though its new oil. Will also check the boost pipes for oil too.
i have the same issue with mine Rich I thought it was my turbo, but i didn't find any oil in the inter cooler or on the throttle body, but looking up from underneath the engine, i could see oil running down the turbo outlet, so its worth checking that. its worth checking your PCV system, is one of the Catch can inlet/outlet vented to atmosphere? as before both mine weren't (stupid mistake lol). mine doesn't happen on start up, but leaves a cloud of smoke when driving.
Yeah I'll have a good look over the turbo, boost pipes ect. I'm hoping it's something simple mate. At idle it's doesn't smoke, only when I rev the engine a little. Hoping to have it on the road legally soon, so I can give it a good blast.
Exhaust guides are very prone to wear on 20v's. Every 20v head that I've had to get done had needed them.. Lowing mileage ones (80k) included! I'd be surprised if it was anything other than that.
I removed the whole PCV vacuum system today, and was greeted with this - A completely blocked one way valve, goosed up pipes and out of shape rubber where the one way valve sits. A quick search of Google shows that a non-working one way valve can cause this blue smoke once the engine has warmed up. I'm going to replace the whole lot and go from there. Thing is Henry, it doesn't do it straight from start up. Only when its warmed up. And it's not heavy plumes. Apparently, worn exhaust guides do this from cold start, which mine doesn't. It takes a good while for the engine to produce the smoke. Will see what happens once I've fitted the new PCV system and go from there.
Not really Russ And my Mk4 1.8T never gave me any headaches likes this! Engine is running lovely since fitting the replacement valves though. I should of really fitted a whole new PCV system when I put it in really. I've got a new valve here, but I think I'll buy new pipes ect just to be on the safe side.
I did have a catch can setup on my last engine, but I was fed up of emptying it all the time so I ditched it. This setup came with the new engine, so I decided to use it.
Right guys, the smoking is back again, and I'm not sure what is causing this. ________________ It will only smoke when - * Left idling for a while and then slightly revved, which causes a bloom of blue smoke out of the exhaust * If I've been driving it for a while, turn off for 10mins, then restart. It "does not" smoke - * From cold start Or * Whist under load ? ________________ I've been told that this could be a number of things from valve stem seals, piston rings, or even the type of oil used. Hopefully its not the turbo ? Any ideas what it may be guys from the symptoms I've described above ? Thanks in advanced.
Er ... Just read a bit of the thread previously , I assume you have checked this out recently and found no fault
It was still smoking after the PCV valve replacement. Whilst its off the road I might go for a catch tank again in place of the PCV system. The thing is, the car runs spot on now, just needs a remap.
I'm thinking stem seals, I'm afraid. My Driver was generally fine up to about 185k, but then I started noticing that when it got plenty warm in traffic, it would smoke as I pulled away. Got worse reasonably quickly, but it was a daily at the time, so getting plenty of use. New stem seals and it disappeared completely. I **think** it won't tend to show itself too much from cold because the oil is thicker then, so less able to sneak past tired seals and down loose guides, mine didn't. I think also that at idle the oil leaking into the combustion chambers tends to build up, rather than burn because there just isn't enough oxygen getting in there to combust it. When you put your foot down to go again, the build up gets burnt fast and a cloud of smoke results. My Gti has been a similar story, but I didn't really sit in traffic that much to notice it doing exactly the same thing (just generally quite smoky when warmed up fully), before sorting it, this time with new guides and seals.
Sort the smoke problem out before you remap it ...car shouldn't need a catch tank. Forget the .... It will only smoke when - * Left idling for a while and then slightly revved, which causes a bloom of blue smoke out of the exhaust * If I've been driving it for a while, turn off for 10mins, then restart. It "does not" smoke - * From cold start Or * Whist under load ? Bla bla bla These things are not fixed on forums but by mechanics in front of them So take it to a mechanic and get it sorted ...if the mechanic can't sort it ..hes a muppet not a mechanic take it to another mechanic
Changing 20 valve stem oil seals ..... [emoji30] I don't envy you mate ... Can they be done in situ ? In the past I have done them in situ on older engines but never a 20v !
