Thanks for that .... my expertise is more towards old carb engines rather than modern diesels
The problem started with fitting brand new injectors .... it didn't smoke before but did after (changed as excessive leakback caused starting issues .....using genuine new Bosch injectors from a reputable diesel specialist)
As the car was parked up for just a few days while I sourced the injectors I can't see valve seals, rings or turbo seals spontaneously failing while it was parked less than a week.
I think it's more likely something I've done (or not done) during the job (or an injector that's faulty from the factory) .... maybe I pinched/disturbed something while removing/replacing the manifold? (slightly annoying design that you have to strip so much to change injectors).
Of course, all the above could be wrong ... just my assumptions.
Nothing showed up on the T4 check so I'll keep worrying at it using first-principles until I get to the bottom of it.
Cheers
K
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