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After a host of troubles, where cold start roughness was the least of my troubles, I replaced the HPFP with a new one. Since replacement I get a little rough running on a cold start, less than half a minute, where the engine runs rough and if you try to drive off straight away it bogs down and won't pull the skin off a rice pudding. I find giving a quick rev immediately after starting helps. After the first half minute it is no trouble the rest of the day. I have aduff nox sensor, too tight to change it since I don't really understand what casued it to fail and they are expensive. I suspect it might be injectors but alreadyb spent so much money that so long as the fuel consumption remains OK and it passes UK MOT I live with it. (2007 330i). Had similar with a 335i, that tended to misbehave a mile down the road but soon cleared. BLack art these things.......
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