Funny thing about coils, they will test a bit higher in warm compared to cold state. Place one in the sun for a while and it can test up to 1 KOhm or more higher than if it is cold. They can also test a bit higher after an engine has been running, possibly due to the warming effect, or simply due to gaining charge through the magneto system. Even without asking Morgan Freeman on Through the Wormhole for the answer, I am sure there is a simple reason for this, but it's just something I've noticed. I remember an old timer telling me that if you get an engine that is a bit hard to start, stand it out in the sun for a while on a hot day and often it will then start. Metal expands when hot, oil thins, vapours rise and expand more, any moisture present will evaporate etc. :-)
