A Drive By Wire Problem?

[Kaz-kzukNA1]

VSS dropping for a few seconds with that heavy single disc dual mass flywheel…

While OBD2 data stream is too slow and timing not guaranteed for any detailed analysis, you should be able to see something on some of the parameters.
IG timing, rpm (Ne), fuel trimmer, etc. No fuel pressure data though.
Do you have OBD2 adaptor and hardware or App to carry out basic data logging?

By the way, misfire detection is surrounded by so many patents from all sorts of companies, car manufactures, etc so some misfire modes have difficulty in being detected by certain algorithm.
Depending on the local regulation, the misfire detection method can be different.
For example, JDM NSX never had 3pin IG coil but uses different method.
For the clarification, having 3pin IG coil doesn't mean OBD2 compliant.

The workshop manual doesn’t show the full picture of the IG coil equivalent circuit and the misfire detection module for the above reason.
You can only check the primary side of the IG coil and to test it properly, you'll need the IG dyno.

Already saw several OBD2 NSX with clear misfire even at idle rpm yet no CEL triggered and not even a code stored.


Kaz