3.6 TDV8 rough idle smoke on cold start

[LRHUE]

I’ve just bought a 2010 L322 3.6 TDV8 
It was more of a heart over head purchase. when I turned up to buy everything was great apart from the fact that it had been warmed up and was idling when I turned up. 
at the time I thought that he was trying to hide something but the car was in great condition with full dealer history and in the exact spec and colour combo I wanted and a good price. 

the problem:
when you start it from cold it has a rough idle and there’s a white smoke from the exhausts for about a mile or so down the road it continues to smoke.
It is also very hesitant if you try to put your foot down. 
Then once warm the car idles beautifully and doesn’t smoke at all even if you floor it. 

There are no splits in any turbo hoses. 
It doesn’t have any fault codes and doesn’t ever go in to limp mode.
If I take the two turbo hoses off the top of the intercooler the turbo on the left side is blowing through a slight misting/smoke but not much with a tiny bit of oil if you wipe your finger around the inside of the hose.
The other side doesn’t have any misting or smoke and feels like it’s blowing stronger. 

However with the pipes disconnected it still smokes at idle. 
It didn’t use any coolant or oil on the 500 mile trip home from buying it. 

Thanks in advance

[L19MUD]

I would put money on an EGR sticking open. Once warm the exhaust gas has less of an effect. Blank them off and try it again

[garrycol]

Sounds more of a glow plug issue.  Try cycling the glow plug process a couple of times before start and see if there is an improvement.  On diesels, white smoke when cold can indicate unburnt diesel from the combustion chambers due them not being hot enough - eg glow plugs not working.

As mentioned, it could also be related to the EGRs but if so I would expect issues when warm as well with them being open when they shouldn't be and causing poor running.

 

Garry