Reasons for excessive smoke

[AudiLeon]

I've noticed at night, there is alot of smoke from the back of the car. Looks grey at night. Never notice it in the day time.
But I just rev'd the car stood still and there is a big black sooty stain on the floor behind one of the exhausts.

What can cause it?

 

[swarcup]

dodgy maf? giving incorrect fuel/air mix possibly is one option. my car does the same in the dark. Faulty injector how is it running?

 

[AudiLeon]

Feels fine really and gets 45mpg on a run.
Maybe it could feel abit more powerfull. It has a tuning box, settings make no difference.

 

[simon.m]

i had smoke from mine when the temp sensor had gone see it when i was parking most or pulling off

 

[AudiLeon]

So the temp sensor (assuming you mean water temp) made a big difference?

 

[Widemonkeys]

I have the same issue but don't get any errors on vag com, I've also noticed on start up after it's been left overnight it stinks of diesel

 

[AudiLeon]

I have the same issue but don't get any errors on vag com, I've also noticed on start up after it's been left overnight it stinks of diesel

That could be the fuel return pipes leaking.

 

[Widemonkeys]

Where are they? Is that what comes off the fuel filter?

 

[AudiLeon]

They're the push fit material covered rubber hoses going between the injectors.

 

[simon.m]

yes mate i had the temp sensor and thromostat done at the same time but mine was not getting to 90c around town but when done the smoking stoped was just a thought mate

 

[AudiLeon]

The thermostat was done at audi about 1.5k ago, so that's fine. I'll try a new temp sensor.
Fingers crossed!
Cheers Simon.

 

[Mike B]

Mines the same and the only fault on vagcom was the temp sensor so just fitted another and will look for the diff

 

[simon.m]

The thermostat was done at audi about 1.5k ago, so that's fine. I'll try a new temp sensor.
Fingers crossed!
Cheers Simon.

no worrys mate was just what i had on mine so if its not that im not paying for it lmao

 

[quattrojames]

Diesels always smoke more at night! I think it just reflects more in the headlights of following cars!

 

[scottie 81]

Mine White smokes and stinks change injector loom checked timing and had new temp sensor 1000 mile ago any ideas