I swapped out the mega for a brand new one, no change.
Using a smart coil from a 2000 Jetta, it's a wasted spark logic coil. I also replaced it with a brand new one, no difference.
I've also carefully inspected the board for broken traces, unsoldered components, etc... but of course the 0.4.4c board is all surface mount. Nothing obviously amiss.
Again, this was all working great for ~ 500k or so.
https://www.amazon.ca/Bosch-0986221048- ... 0608&psc=1
I am thinking the ignition drive transistors on the speeduino board have failed. too much current? do I need to add something (resistors) to limit current ? (with a new board
). However I would think that they would fail suddenly, not gradually? and not be intermittent first?
This is weird too... I just noticed on the bench that with the arduino + speeduino plugged into usb (so just 5v, no 12v connected to speeduino) the ignition channel LEDs all light up (dimly)...like there is a short to ground through the igntion channels.