2017 Volt Engine misfires while in open loop. No DTC, so dealerships cannot diagnose. Their mechanic experienced the misfire on test drive. Intermittent miss: similar to a failing plug wire. Question: Does the cpu record pending dtc's while in open loop?

  • In Skoda 2006 when the engine get intermittent missfire, it shuts down that cylinder (cuts of fuel) until I park and clear it with an OBD scanner. – Aus Apr 20 '17 at 15:47
  • Maybe put a COP secondary probe in place and check the waveform while it misfires. would probably be the easiest place to start. or warranty the engine... – Ben Apr 21 '17 at 5:28

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