TSI Engine Smoke?

[MorganRVF]

Hey all,

I have a 2018 T6 150 TSI that has done 100k miles. I have had it for a week and it's been checked by a garage and it's got no major issues, though I left it idling today for 10 mins and noticed it does tend to smoke a bit more than I was expecting and there is definitely some black deposit on the floor. Wondering if I'm panicking over nothing?

 

[Sasquatch]

Get it hot, get your local MOT station to stck it on their exhaust analyser, then relax with that weight off your mind. Or maybe run around in frantic panic. either way you need the MOT mans probe up your rear to know.

 

[Lubrown]

Even at ten minutes (especially just idling, not running about) your engine is still cold. Damp sooty stuff will come out. Give it a run then take a look

 

[Lubrown]

Get it hot, get your local MOT station to stck it on their exhaust analyser, then relax with that weight off your mind. Or maybe run around in frantic panic. either way you need the MOT mans probe up your rear to know either way.

Ah, you beat me to it with the temperature. Great minds…

Good idea with the MOT station though.

 

[MorganRVF]

Get it hot, get your local MOT station to stck it on their exhaust analyser, then relax with that weight off your mind. Or maybe run around in frantic panic. either way you need the MOT mans probe up your rear to know.

Haha thanks! I'm probably just panicking as it's a new purchase, will get it hot and see if it's any better

 

[Dav-Tec]

Check the PCV isn't duff, What's it like at idle

 

[MorganRVF]

Check the PCV isn't duff, What's it like at idle

Seems pretty stable, What's the PCV?

 

[Dav-Tec]

Seems pretty stable, What's the PCV?

Just re-read the thread properly – my mistake, I skim read it earlier while getting distracted and jumped straight to PCV.

PCV = positive crankcase ventilation. It’s basically the crankcase breather system that routes vapours back into the intake. When they fail they can cause smoke, oil vapour getting pulled through, odd idle/vacuum issues etc.

That said, if it’s only been idling from cold for 10 minutes I wouldn’t panic just yet. A petrol that’s been sat idling from cold can chuck a bit of sooty residue out the exhaust anyway.

I’d get it fully up to temperature and take it for a proper run first.

If it’s still doing it when properly warm then it’s worth digging deeper – PCV, fault codes, fuel trims etc just to make sure it’s not over-fuelling.

 

[darkman884]

just condensation i would suggest

 

[MorganRVF]

Thanks, I just had a series of fault codes last night:

P119A00
P129700
P218700

All of them have the PCV as the common denominator so will be taking a closer look at it. Is there a part number list on here somewhere that includes TSI bits? Seen the detailed workshop manual on the TSI Engine but would be good to find a proper part number

 

[manfrotto]

A quick test of the PCV valve...

 

[MorganRVF]

A quick test of the PCV valve...

Ah brilliant, will have a go with this tonight. Thanks

 

[MorganRVF]

Done the above test and there is a good amount of suction from the oil filler cap. Codes popped up again but I'm not feeling or heating any difference to how it runs

 

[Dav-Tec]

Could be n249 diverter valve or a split in a vac pipe which will need a smoke test to find it, my money's still on pcv though had a member on here think it was @Gazbadge with similar issues and was the pcv on that to they are fairly common. Again there's a good chance I'm wrong but without doing further tests it's still just a gut instinct

 

[MorganRVF]

I took the oil cap off on idle and felt the suction and the engine rpm dropped, on the verge of dying. It's not hugely expensive so I could just crack on and swap it

 

[Gazbadge]

I've changed mine twice now, it made a huge difference to the van. I didn't get smoke though, it was what seemed like a misfire with mine. I've heard they are commonly replaced on EA888 engine around 40-50k miles

 

[Ali-G]

I've heard they are commonly replaced on EA888 engine around 40-50k miles

Got rid of the PCV on my Golf R and fitted a Racingline catch can, no more sh1te being pumped through my engine, you wouldn't believe what comes out of it when I drain it.

 

[mmi]

Thanks, I just had a series of fault codes last night:

P119A00
P129700
P218700

All of them have the PCV as the common denominator

What's the reasoning behind the PCV being the common demoninator - instead of a detected sensor malfunction as indicated by P119A00?

 

[Shaun Witts]

Got rid of the PCV on my Golf R and fitted a Racingline catch can, no more sh1te being pumped through my engine, you wouldn't believe what comes out of it when I drain it.

My first car was a Cortina mk 2 pre cross flow. The crankcase breather on that was just a pipe from the top of the engine to an open end at the bottom. This meant that one side of the car underside never needed rust treatment due to the amount of oil deposited on it from that breather!