MK5 Golf GTI

All Things Mk5 => Mk5 General Area => Topic started by: Keks3003 on February 22, 2022, 02:29:14 pm

Title: Black spots on trunk 2.0tfsi
Post by: Keks3003 on February 22, 2022, 02:29:14 pm
Hello guys, im having problem with my mark 5. Every time after ride i have black marks on trunk. I dont what could be it. Oil is ok, in 6000km only 0.6 did take, so oil isnt... Any idea ?
(https://i.postimg.cc/c1zBPkmN/IMG-20220222-144555.jpg) (https://postimg.cc/nMvmDkgd)

(https://i.postimg.cc/DZyc3tH7/IMG-20220222-152348.jpg) (https://postimg.cc/p94jD1PS)
Title: Re: Black spots on trunk 2.0tfsi
Post by: pudding on February 22, 2022, 03:49:11 pm
Sooty tune?
Title: Re: Black spots on trunk 2.0tfsi
Post by: Keks3003 on February 22, 2022, 05:45:06 pm
Could it be from faulty thermostat ? Just came from drive, and the car did not get to 90° after 25min of ride....
Title: Re: Black spots on trunk 2.0tfsi
Post by: pudding on February 22, 2022, 07:56:19 pm
Yeah I would replace the thermostat first and go from there.
Title: Re: Black spots on trunk 2.0tfsi
Post by: ljc19630 on February 22, 2022, 10:13:46 pm
Can you see if the thermostat sits at 90degrees? That’s also a sign that it needs replacement if not ?


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Title: Re: Black spots on trunk 2.0tfsi
Post by: DBXdarkangel on February 22, 2022, 10:39:01 pm
Black exhaust soot is faulty thermostat? Interested in this as mine has black soot for past 5 yrs
Title: Re: Black spots on trunk 2.0tfsi
Post by: Keks3003 on February 23, 2022, 04:26:12 am
Can you see if the thermostat sits at 90degrees? That’s also a sign that it needs replacement if not ?


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No doesnt sit at 90, only at stop will come to 90.  I will try to replace it.
Title: Re: Black spots on trunk 2.0tfsi
Post by: pudding on February 23, 2022, 09:28:46 am
Black exhaust soot is faulty thermostat? Interested in this as mine has black soot for past 5 yrs

It's not the sole cause, but a contributing factor. 

TFSIs are very sooty engines anyway because of how they operate.  Remaps compounds the problem but I've seen standard cars chucking out black smoke under hard acceleration as well, so not a lot you can do about it really, other than convert the engine to port injection!
Title: Re: Black spots on trunk 2.0tfsi
Post by: Mekaniko on February 23, 2022, 04:33:43 pm
Mine have the same... maybe the coils? As all the petrol could not be burn?
Title: Re: Black spots on trunk 2.0tfsi
Post by: RBS on February 23, 2022, 07:07:23 pm
 :thinking: Isn't that just condens which is blow out of the exhaust?
Title: Re: Black spots on trunk 2.0tfsi
Post by: pudding on February 24, 2022, 09:24:50 am
I would only expect steam/boost to blow some accumulated soot out of the exhaust if it does mostly short journeys, but a daily driven car doing a reasonable amount of miles shouldn't do that.  Mine doesn't, and never has.
Title: Re: Black spots on trunk 2.0tfsi
Post by: Mekaniko on February 24, 2022, 12:21:52 pm
Well yours is black... but I think that is not normal too.

Mine is doing it since at least 3 years ago and still running perfect.
Title: Re: Black spots on trunk 2.0tfsi
Post by: pudding on February 24, 2022, 03:45:26 pm
You can still see soot and oil spotting on a black car..... especially when it's dirty.
Title: Re: Black spots on trunk 2.0tfsi
Post by: LC5F on February 24, 2022, 07:48:42 pm
What's your oil consumption like?
Mine used to chuck out a lot of soot and I could see in the mirror on hard acceleration a plume of stour/dust coming out the exhaust. Tail pipe and bumper sooty.
Mine had high oil consumption, changing to thicker oil helped but still high, double the recommended at 2 litres per 1k miles - eventually pinned this down to blown oil seal in the hot side of the turbo.
Now I barely have any soot on the exhaust & oil consumption has quartered.
Title: Re: Black spots on trunk 2.0tfsi
Post by: FatWelshBoy on February 24, 2022, 07:56:20 pm
Perfectly normal, mine does it and when I've had a look at other cars they are the same.
Title: Re: Black spots on trunk 2.0tfsi
Post by: Jb55 on February 25, 2022, 12:32:15 am
What's your oil consumption like?
Mine used to chuck out a lot of soot and I could see in the mirror on hard acceleration a plume of stour/dust coming out the exhaust. Tail pipe and bumper sooty.
Mine had high oil consumption, changing to thicker oil helped but still high, double the recommended at 2 litres per 1k miles - eventually pinned this down to blown oil seal in the hot side of the turbo.
Now I barely have any soot on the exhaust & oil consumption has quartered.

What was the fix ? Turbo reconditioned or new turbo ?
Title: Re: Black spots on trunk 2.0tfsi
Post by: Keks3003 on February 25, 2022, 06:45:04 am
What's your oil consumption like?
Mine used to chuck out a lot of soot and I could see in the mirror on hard acceleration a plume of stour/dust coming out the exhaust. Tail pipe and bumper sooty.
Mine had high oil consumption, changing to thicker oil helped but still high, double the recommended at 2 litres per 1k miles - eventually pinned this down to blown oil seal in the hot side of the turbo.
Now I barely have any soot on the exhaust & oil consumption has quartered.

Oil consuption is ok, 0,6l 6000km.....
Title: Re: Black spots on trunk 2.0tfsi
Post by: Mekaniko on March 13, 2022, 04:56:27 pm
What's your oil consumption like?
Mine used to chuck out a lot of soot and I could see in the mirror on hard acceleration a plume of stour/dust coming out the exhaust. Tail pipe and bumper sooty.
Mine had high oil consumption, changing to thicker oil helped but still high, double the recommended at 2 litres per 1k miles - eventually pinned this down to blown oil seal in the hot side of the turbo.
Now I barely have any soot on the exhaust & oil consumption has quartered.

I was pointing that too the turbo, and makes a lot or sense. Thank you for sharing your experience.

Title: Re: Black spots on trunk 2.0tfsi
Post by: LC5F on March 14, 2022, 10:02:26 am
@Jb55 (https://www.mk5golfgti.co.uk/forum/index.php?action=profile;u=61858) & @Mekaniko (https://www.mk5golfgti.co.uk/forum/index.php?action=profile;u=45038)
Mine was very obviously burning oil in the turbo, downpipe off there was carbon around the turbine wheel where oil was coming out past the seal
But - at the same time I also had my head serviced at the same time, unsure how much ware there was in 95k miles, but it did get new valve guides & seals.
Title: Re: Black spots on trunk 2.0tfsi
Post by: pudding on March 14, 2022, 12:24:44 pm
Turbos usually go first but sometimes you can get guide wear as well, just to add to the party.

Out-rule the engine by doing a compression/leak down test and borrow/buy a borescope and inspect the cylinder walls.   If that side of things is all good, it's likely the turbo by process of elimination.

You can also check for valve guide wear by letting the engine over-run down a long hill in 3rd or 4th, then nail it at the bottom.  Big cloud of blue smoke?  Guides.

Oil smoke/burning oil smells after idling for 10 mins, such as heavy traffic, could be either.  This behaviour seems to be fairly common with modern petrol DI Turbo engines though.  I've sat behind 3-4 year old Minis, 135is and MK7s that stink of burning oil in heavy traffic.  No smoke when they pull away, but I can smell it.  I was in the missus's TDI at the time, so knew it wasn't my car doing it  :grin:  They were probably all remapped or neglected. Shot turbo bearings.