Quote Originally Posted by spfautsch View Post
My initial question was generally posed to steveo. The diy-ltcc controller is tracking cylinder # and time between tdc signals. Creating a function to dump all 8 cylinder's 90 degree times to the serial data would be trivial. Tracking angular velocity between tdc signals is (at least as I understand it) how obd2 ecms detect individual cylinder misfires.

The cylinder id will only let you identify cylinders 1, 4, 6 and 7, and you'd need to extrapolate the others without indexed low res triggers. But the I believe the aldl data is going to be too slow to give useful information on individual cylinders. I've never noticed an rpm delta pid, will have to dig that one up and see what your'e talking about.
There's an rpm variation in EEHack