i know this is somewhat old now, but my Zafira 2l DTI , has just started doing the same thing
yesterday broke down and breakdown team, would not go above 1000 revs, and smoke/black/blue from exhaust - they took it to a centre to put on a flat bed , and it was looked at and worked
drove 80miles all OK
drove around today and was OK
then stopped again at store carpark
checked the EGR valve actuator and it was free and moved OK with engine running , it would not move - so solenoid is working,
we stated to move it to go home slowly and it suddenly cleared
so now at home
set to high revs 2000 and wiggled every pipe and cable I could get to and see if engine would change and no looks fine
still has oil in
so planning to clean out the EGR on Monday (£320 to get a part)
But would be good to know if it was the exhast or EGR or something else , i can at least have a look and good to hear from someone who has exact same symtoms
thanks
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