Black smoke.
 

I just bought a 2005 2.0tdi Audi a4 .

I noticed a lot of black smoke clouds of it on load. (none when turbo kicks in)IT is bit sluggish when cold but when warm runs great. turbo pulls fine.

engine management light came on other day i read ecu which said the following.

17057 - cylinder3glow plug circuiit (q12) electrcal fault.
16485 - mass air flow sensor (g70): implausible signal.

I reset and 3-4 days later came back on with same error.

i been told it has had a AMM fitted but this was guy i bought car off so might not be the case.


Any ideas?

black smoke on a diesel is normal...to an amount. If it's more than usual than you've got something wrong. I know diesel pickups more than cars though. But does your engine idle ok? If you mass air flow sensor is going bad or is bad, that will throw off things like an idle or maybe too much fuel (then causing black smoke). That would be an easy fix if you bought the part and installed it yourself vs a mechanic. Not sure on the glow plug thing but if the code keeps coming back, I'd get it checked out.

Car idles fine.

I notice more when engine warms up the black smoke we are talking clouds of smoke just before turbo kicked in. say doing 30-40 in 5th and you put foot down. so more load.