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.
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