Quote Originally Posted by NomakeWan View Post
It's possible you aren't getting a good ground, sure. But as I believe I've said before in this very thread, the code isn't really important; the code doesn't mean anything about the signal from the sensor. It's looking for a voltage difference due to a resistor inside the knock sensor that isn't actually related to the function of the sensor itself. So if you're getting proper signal from the sensor, Code 43 is irrelevant. Again, on my '95 Corvette I just disabled the code rather than bothering to replace the sensors, because the sensors were still providing good output.

Trimalyzer is absolutely free. You just need to tell it how your CSV logs are formatted so it can plot the data for you. http://fbodytech.com/trimalyzer

It is absolutely possible to do a scatterplot with Excel as well (since that's all Trimalyzer is actually doing).
Thanks - Downloaded Trimalyzer. Really easy to use, had a scatter plot of my knock counts in a few minutes. (attached) but not sure what it's telling me. Most points are in the middle RPM range, not surprising. Looks like there are some anomalies in the low RPM/low load area?

OK, I'll start learning to not worry about the code 43 and will probably eventually disable it in the code. But I am still concerned about my very high knock counts. knock_count_scatter.jpg