'07 Cobalt LS, 2.2 L I-4
Car is not getting a misfire code. (p030x) However, the mode 6 data shows Non-zero "misfire counts" on all cylinders. The counts are single- or double-digits, and are very low at highway speed. I don't feel any misfires, and I'm not aware of a performance problem.
- Should these counts be just dead-nuts 0?
- Is misfire detection reliable at high speed?