[ischmitz]

Hey Jack, agreed the tap would make me nervous, too. And unfortunately, intermittent faults are the hardest to track down.

In your case I am wondering how things add up? If the DME is sensitive to vibrations due to an internal fault I would expect effects when driving, too. E.g. a slight miss at some point. Your knock should not be very different from normal vibrations transferred from the car chassis to the DME housing.

The DME is actually pretty stupid when it comes to starting vs. running. If it sees a correct flywheel signal it is running and issuing spark and fuel signals. If the flywheel signal isn't present the fuel/spark signals stop momentarily.


Cheers,
Ingo