Originally Posted by
dr.mike
A few notes about that trace.
1. at the end of the trace, each WB is showing its maximum value ( i.e. @ 5v ) because the actual value is out of range. Probably near free air. So AEM shows 1.22 Innovate shows 1.50, etc. None of them are "right".
2. The innovate outputs in steps of 82ms. So, it loses all of the detail faster than that. And the signal is delayed by about the same 82ms.
Both the AEM and PLX caught what looks like a misfire event, while going lean. It also has a lot of noise; probably from the sensor's heater driver.
3. The PLX did not really respond to the rich dip that both the AEM and Innovate showed. It kinda flat-lines at 11.3 while the other two WBs show rich spots below 10.0 It seems that the PLX responds faster when going lean than when going rich.
4. As expected, when the AFR is steady, all 3 WBs basically agree on the value.