Why is my friend's Audi A6 emitting excess smoke when idling?

A friend's 2007 Audi A6 2.0 TDI had a DPF removed and deleted, as well as an EGR shut. It also had a remap done. From test drive, the vehicle begun emitting excesses smoke when the engine was heated and idling. He has done several checks as well as changed a set of fuel injections but the problem remains. No smoke is emitted on acceleration but there is bellowing smoke like a rising chimney when idle. Any ideas to the cause please?

Asked on 6 January 2017 by Ron

Answered by Honest John
What your friend has had done to his car is ILLEGAL. All we will do is recommend that the car be taken to a VAG specialist and returned to standard.
Similar questions
I'm a sole trader who recently sold an Audi A3. The buyer said they were having it remapped even though I told them it would void any warranty on the engine, clutch and gearbox. Subsequently, almost straight...
I bought a Volkswagen Scirocco from a private seller in October 2016. The car was fully serviced and appeared to be in good condition. The other day Volkswagen did the emissions update and it completely...
I'm looking at getting a Superchips Bluefin remap for my new 2016 Ford Focus 1.5 EcoBoost, 147PS with 2600 miles on the clock. The remap boasts a 47PS and 63Nm torque increase, although I'm well aware...
Related models
High quality and refined cabin. Good engines including frugal TDI diesels. Maximum five-star crash test rating. Classy image.
 

Ask Honest John

Value my car