Clogged swirl flaps
Thank you both for rapid replies.
No I haven't upgraded the flaps, didn't know about the possibility. Also the bill was high enough already!!
I will look into the Egr mixing chamber but know nothing of it. The little garage it is serviced at thought of blocked breather and checked it: apparently no problem but will look again.
The engine runs, and has run, really well: no smoke at all even under heavy acceleration, uses NO oil at all etc etc
I was disappointed really: I had thought a Volvo would be better thought out! It really might explain why so many have acting rod failures.
And now it is all clean: wow! Does it shift better throughout all rev / accelerator range! Much quicker and doing better mpg too at present .
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