Interesting. So BMW later switched to a wasted spark ignition regime on the M42, versus spark-per-cylinder? I know that the E30 M42 will go to wasted spark if the cam sensor stops functioning, but will do spark-per-cylinder otherwise. What is EWS? "Electronic wasted spark"?
What changed in the trigger wheel? Are you referring to the 60-2 tooth wheel on the crank, or the cam sensor? I know that the M44 used a different wheel on the cam.