I finally got sometime on the V40. I repaired a suspect loom problem at a spot about eight inches down from the maf plug. This didn't help matters but fitting a new maf sensor did the trick.
My usual motor factors couldn't supply one and i couldn't afford volvos price but found one at europarts one make only starline. It fitted ok, the inlet going into the airbox was 1.65mm larger than original but pushed. I did 110mls in it today and she runs OK, well, back to how it was before breakdown anyway.
Thanks for help.
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