Mis-Fire Dectection

[Neall Booth]

Can anyone out there explain to me how Ford and Chrysler detect misfires
on 96 and newer vehicles (OBD-II equiped).  Of special instrest would be
the Chrysler 5.2/5.9/8.0 engines, and the ford 4.6/5.4/6.8 engines.

I know that Ford uses coil-on-plug on the 5.4/6.8 and that it plays some
role in the detection system.  How do they do it?

With the Chrysler engines I have heard they look at torque pulses to
determine misfires.  Again, how do they do it?

Thanks 


Neall