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Okay, doubt loose carbon lunched the turbo, my old Civic was terrible for the same thing and they would generally seize up leading to over/under boosting. You would need to feed it harder stuff than the crap off the vanes to worry it in a one off situation.
First things first are the vanes moving freely? That would be my first check, if it's mechanical activation it's a simple check, if it's vac then you may need to mess about. In fact if it's vac then check you don't have a leak, if it's not opening up then you could be under fuelling (though I'd expect it to realise thats the case but PDs were easy to "tune" because they weren't particularly fussy).
the vanes etc are clean and moving fine now, vac is good and n o under/overboost codes, as I said i didn want to complicate the discussion with things that werent relevant, so trying to keep it to the point
google is a minefield
Nothing to do with turbo operation as it's happening at idle. Possibly a turbo oil seal leak, but it's now looking like injectors I reckon.
True, got a bit excited there. Been a long day.
Liqui Moly Diesel Purge looks like my next logical step, to try to clean the injectors.
And a compression test if i can find a way to do that
Compression test needs specialist gear AFAIK, you need to remove an injector (or perhaps glow plug) and fit a pressure gauge in place then turn the engine over manually to check the pressure it can create in the cylinder. Someone correct me if I'm wrong.
I had a Berlingo that eventually started to smoke white smoke really badly after it had idled for a while. We are talking world war 1 tank levels of smoke. Embarrassing and dangerous.
The garage thought that it was the turbo that was faulty so replaced that. It was not a pleasant feeling to find it was exactly the same after the new turbo.
Further investigations via a compression test found that one of the injectors was leaking fuel into the cylinder. The constant flushing of diesel in the cylinder had caused the cylinder wall to become scored.
I traded it in for 300 quid.
Update
There was not enough room to use the compression tester I got.
Anyway i tried the diesel purge, the youtube method.2nd time it worked,1st time I was not as prepared as i thought. (TIP- watch all the youtube videos on it you can, if it can go wrong, it will go wrong)
Fortunately, an old diesel mechanic just happened to be around, miles from anywhere,and he gave me a lift home and told me how to start the car again.
With VCDS the timing was altered slightly,to improve things
The emissions were still too high,so I got a couple more liqui moly products,and thats lowered the emissions a lot, so now its all good, and I can sell the other car, go on holiday, etc.
Thanks so much for all your help.
Which products?
diesel purge, motor oil saver, and oil smoke stop
oil saver "takes 300-500 miles to work"
Liqui Moly suggested to use Motor Clean also,but you need to change oil when you do that,and id only just put the oil saver in.So thats waiting for next oil change
Wait, something destroyed the fins on the exhaust side of your turbo? the fins on the impeller, rather than the VNT fins?
In my mind, that means something came out of your engine, via your exhaust valves. It would have made it's way in too, and smacked around in the cylinder for a bit. Damaged valve seats is a strong possibiliy, along with damage to the bore/piston or injector nozzle. Any of these would explain the smoke.