Golf 7 1.2 TSI (105hp) black specks on the back of the car

[Minulache]

Hello,

I have noticed that from some time, my car started to leave black specks on the back of it. Also, the exhaust started to get black. I have noticed that sometimes the exhaust starts to smoke (black as I saw). What can this be caused by?

Also, this problem started when I started to have some misfires, replaced the spark plugs and the misfires went away. It also started to consume more oil since this.black speck.jpg

[Crasher]

Are the specks dry or slimy?

[Minulache]

I will look today when I get in the garage in order to check in on the garage floor. From what I saw they might be slimy, but I will check to be sure.

[Minulache]

Sorry for the late update, the specks are dry, not slimy. What does it mean?
Also, if they were slimy?

Thank you!
LE: I also observed a weird thing. I went on a long road the other day, and sometimes, when I pressed the accelerator, the car would stutter a bit and then leave a puff of black smoke (seemed black) behind.

[Crasher]

That suggests the marks are carbon from un-burnt fuel being carried out and deposited by water vapour, if they wee slimy it would suggest oil burning and the visible smoke would have a blue tinge. You should start by having the care fault code scanned using proper VAG specific diagnostic equipment.

[Minulache]

I've already done that. There are no error codes besides my air quality control. Note that it was VCDS scanning and Obdeleven. I guess that it is something sensible that the ECU doesn't detect as being wrong or out of spec.

[Crasher]

It could just be left over soot from when it was misfiring but you say it is using oil?

[Minulache]

I'm pretty sure it's not left over soot since this issue has been going on for over 1-2k km. Yes, it is using oil also.

[Crasher]

If it was over fuelling the ecu should pick it up so even though it is dry it may still be oil soot which is not good...