[CamB]

Thanks Warren.

It has no vacuum anything - just mechanical advance which (seems) to work, although it is pretty short (I believe it is a "performance" distributor). Timing an '02 isn't as easy as timing a 911 unfortunately - there is a TDC mark on the crank pulley but no other timing marks and you are expected to look at an inaccessible hole in the bellhousing.

Can I take it that a dwell reading which changes with RPM is a definite no-no! It certainly doesn't make sense.

I seem to remember reading somewhere that the breaker plate can wear and move around.