On a number, of occasions when I have been in the garage, I have been surprised to hear my Brooklands M3W 'chatting to itself' for no apparent reason. Cold engine and ignition off. In my ignorance a cursory investigation failed to find the source of the very intermittent sounds and I assumed that "they all do that Sir". I was however concerned about a potential drain on the battery. More recently an 'Elder Statesman' of the marque had my trike in his garage for some TLC and was intrigued when he heard the same sound. He traced it to the stepper motor activating the idler air valve, but in spite of his superior knowledge and diagnostic kit he was unable to establish why it continues its occasional and intermittent running.
Has anyone any ideas?
