audi A6 avant - Audi A6 excessive black smoke

Honest John Back Room » Technical matters
View Threaded
Tue 12 Aug 2014 18:43
audi A6 avant - Audi A6 excessive black smoke - adrian19

I recently asked the forum about my A6 smoking if revved. I have stripped the egr valve and all surrounding pipes, the egr valve did not have a lot of carbon in it but ther was quite a lot of engine oil leaking around the valve and inside the pipes had a deposit of oil. it seemed to be leaking out of the egr valve all around the area was quite a build up. there are lot of small pipes in this area as well so I cannot find whrer tyhe oil is coming from. The air filter is clear of any oil. Any ideas.

Reply | Report as offensive | Link
Thu 14 Aug 2014 12:10
audi A6 avant - Audi A6 excessive black smoke - dieselnut

Most turbo's pass a small amount of oil past their seals, especially as the miles pile on.

This will get blown through the air pipes to the EGR then into the engine & get burnt.

Should be nothing to worry about unless it is excessive & you are having to top up the oil frequently.

Edited by dieselnut on 14/08/2014 at 12:11

Reply | Report as offensive | Link
Thu 14 Aug 2014 18:19
audi A6 avant - Audi A6 excessive black smoke - adrian19

Thanks for the reply, I do not have to top up oil from one oil change to the next. the oil seems to escape from two small holes under the egr large diaphragm then can drip onto exhaust, but does not give a problem.

Reply | Report as offensive | Link