I'm now thinking there may be a more pervasive electrical problem
causing the Herky Jerky symptoms (chuggle).
The system voltage always shows up kind of ragged in the scans. Take a
look at this:
Here are my notes on the episode shown there:
4.18: 12.4 minutes into trip. CC set at 66 mph, maintaining 67, TCC
speed (or at least the speed sensor?) suddenly drops to 61. Throttle
opens (as it should
this time!) but seems happy to hold 61 mph for 8-9 seconds, why? TCC
stays on. Battery voltage looks rough throughout, between 13.4-13.6.
were a few dives in inj. pulse width before and after the speed fall
suspicions: Since events seem to be preceded by drop in road speed,
it be a sudden increase in drive-train resistance? Or, ref voltage
on speed sensor?
Does anyone know if this kind of fluctuation is normal on one of
these GM CS-130 alternators?