Hello,

I have a 383 LT-1 which has been converted to run a 411 PCM with coil per cylinder ignition. The problem is, no matter what I do to the tune, I never see knock retard. This has me worried and thinking I've messed something up in the tune or knock sensor wiring.

For example, I tried the trick of hitting the block with a screw driver and still got zero knock retard.

I have tried pushing advance slowly up to 50 while idling, and no knock.

Can anyone provide some tests I can do? If I backprobe the knock sensor pins, is there a voltage or resistance I can look for?