That would be very strange indeed. I confirmed from the Blazer forums that they are indeed using native 8192 baud comms out of Pin M (or Pin 9 on '95 vehicles), without any resistor.

Generally any tuning place worth their salt is going to have a knock box. It's an external knock processor with its own knock sensor. Mount it to the motor you're tuning, put on headphones, actually...

Every GM vehicle had a unique knock filter, because GM understood that every operating environment was different, so to improve their ability to detect knock across a wide operating range, they tuned...

Holy crap. Either you have a ton of knock, or your knock filter is shot, or...I dunno, you just magically have an engine with a sound profile that, over its entire range, just happens to fall within...

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...

Considering the 10k resistor thing only applies to the earlier ECMs that used Pin E for 160 Baud ALDL, I'm gonna go ahead and say that won't be it. The '7427 is a '93 PCM, so it'll be using Pin M...

Generally adding more sealant makes a knock sensor less sensitive, not more. Also usually when looking at knock I look at a scatterplot; it's what Trimalyzer does really well, for example.

How do you know if it's real knock? Put high octane fuel in and pull all the timing. It won't make much power, but it also won't knock. If it says you're knocking anyway, it ain't real.

As others have alluded to, changing the knock sensor isn't going to change the outcome. The only thing the ECM cares about regarding the sensors is the resistance. It uses that resistance to check if...