Noisey Start Up
A mechanic who has rebuilt his own engines suggested my noisey start up was almost certainly due to dry hydraulic tappets, and not the ECU/DME re-learning anything. I had assumed that once the oil pressure had built up these would sort themselves out, and therefore it was due to the ECU not setting up the Vanos: but he says it will be the hydraulic tappets, as they often do not start to work until the oil has warmed and thinned sufficiently to work its way in to the tappets .
Since my engine has been dry stored for 5 years the hydraulic tappets may have been a bit sticky too.
He says they do sound awful, and make you wonder if you've left a spanner in the head!!! But you just have to be patient (and confident that you did put it all back together correctly!!)
Mike
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