Yes, EDC17 has different maps for driving modes. Not sure what experience folk on this forum have with EDC17, but you're probably best referring back to your tuner. I, personally, have very limited EDC17 experience.

Only different maps are Driving wish maps wich won't  couse such behavior. Try to log mean injection actual boost and rail press. Also next run egt at turbo, particulate filter and maf airmass. We had cases that sticking vnt couse similiar behaviour in such engine (yes i now it's not that old). 170 version run on lower lambda and they run a bit more "dirty" then 140hp version.

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Sorry for the late reply.  Missed/forgot about this thread.

Totally stock car in terms of tuning.

I can understand the different maps from the drivers wish and driving modes for different settings.  Unfortunately I have zero experience with logging diesel engines or even tuning them.

Like I say, the issue is only very occasional, but there is a noticeable dip in power there.  Granted most people wouldnt feel it, but ive tuned me7 cars before and know how different things adapt the feel of the car and when something isnt working as it should.

Viski_b - do you know what blocks I need to log?  Only get the advanced measuring values on VCDS, and not the normal measuring blocks,  so no idea which blocks relate to what. 

I have heard of one or 2 people mentioning the actuators being a bit weak on these 170 engines.

TBH, sport mode feels no different to the normal driving mode.