So, one of my friends accidently refueled his 1.4 TSi Scirocco

Is it doing it all the time ? Any engine check light on?

>>14693490
He is not driving it, it keeps doing it when he starts is and really black smoke is coming from the exhaust.

92 is still high enough.

I m asking abot the rpm not being stable , cause i hsd the same problem and it was a lambda probe , but in your case it might be something else . Best thing to do is to check it with an OBD reader

>>14693499
Sounds more like a blown turbo or hoses to/from there. Which is kinda common on VWs, I think?

>>14693453
>one of my friends accidently
this is an anonymous imageboard, we wont judge you for stupidity.

>>14693453
Its coincidence. Misfueling won't cause any problems unless you put diesel in gas or vice versa.

Tfw would rather scirocco than golf

>>14693453
>He used up the whole tank,
Blocked injector, or sticky pump caused by running the tank down after filling up with dirty fuel.

It's a 1.4 Tsi, it will eventually die because of its legendary unrealiability and because it drinks oil like a bitch does with cum.

>>14693569
If your injectors are very particular they can get fucked up by pissfuel, not to mention ridiculous engine knock if your engine has a high compression ratio.

>>14693665
I highly doubt OP's car doesn't have a knock sensor and maps which could compensate.

Car manufacturers always have to assume the worst to an extent. One tank of slightly less octane fuel shouldn't make a difference.

I call coincidence. Maybe the different fuel exaggerated an existing issue but I doubt it was caused by it.

>>14693579
I'd rather a Leon SC, shame it has that boiracer status.