[sherlock9c1]

PCM pinouts and connector ID: 4th Gen LT1 F-body Tech Articles (shbox.com)

 

[sherlock9c1]

One thing you could do is download TunerPro and the $EE XDF and see if speed density is enabled. It's been awhile since I've played with speed density mode, but it's a possibility if the MAF is feeding the PCM but the PCM isn't reporting. I'm not sure what the PCM does if it's in SD mode but the MAF is active, if eehack will report MAF data or not.

 

[sherlock9c1]

Knock sensors are easily faked. Only buy name brand from a reputable supply chain. I wish I could find the cutaway images I saw one time on the internet of some that literally just had a resistor inside. No piezo at all.