I thought you were saying that the LT4 KM was only meant to work with the OBD-II KS (since it came out in 1996). I was trying to get across that if it directly interfaced with the KS the impedance mismatch would set a trouble code (which it does not).

My datalogging only proved to me that there was some knock that "went away" after installing the LT4 KM. That is what I am saying worked.

I don't have enough technical data of the PCM or KM to be able to ascertain what electrically happens.

 

what else effects the knock retard, i know my knock sensor is working right,and its not dececting knock but im still getting know retard so what can cause this? thanks for all the help, kyle

 

You are absolutely SURE you don't have DTC 43?

How do you KNOW your knock sensor is not detecting knock?

Do you have a high voltage ignition wire in close proximity to the KS harness wire, causing interference?

Is it possible your motor mount on the passenger side is loose or broken?

Is it possible you over-tightened the KS into the block?

Is your knock count, observed with the Tech-2, incrementing at idle?

What is your ignition advance at idle, observed with the Tech-2? Is the programming in the PCM totally stock.... no Hypertech, no mal-order tune, etc?

 

no codes, mad z28 and stock tune both do it, i can take the knock sensor of and hold it in my hand and it will still pull timing,

 

So, you are not seeing any knock counts incrementing, just knock retard?

 

As stated, if the KS circuit is not complete, the PCM defaults to internal calculation tables, based on engine operating conditions, and invokes virtually full time knock retard.

If you have the knock sensor in your hand, the circuit is incomplete, you will get DTC 43, and it will still pull timing.

 

i had a wire still grounding the knock sensor when it was in my hand. my knock count goes up but my sensor ohms isnt changing, last night on the ride home it was 7 knock count and 0 retared so it was working, then i reved and knock count went up to 39 and 3 retared then back to 0, so i think my plug wires were interfearing with the knock sensor, now i just have to work out the senceitivity.

 

Might have been a good idea to include that info with your previous post
How many time do we have to tell you the knock sensor resistance doesn't change. The signal is NOT.... repeat NOT...... repeat NOT..... voltage or resistance dependant.

Also, the knock count does NOT correlate to knock sensor activity. It's possible to get knock retard WITHOUT a change in knock count, and its possible to get an increase in knock count WITHOUT knock retard.

Doesn't prove anything is working. Knock count is a cumulative field. It increments up into the thousands, then resets to "0" and starts over again. The fact that you saw a knock count of "7" means nothing. It could sit at one number forever, and you could still be getting knock retard.
I already suggested the high voltage issue.

Check your MAP sensor. The fact that it pulled timing when you revved it may indicate the PCM thinks the engine is under a much higher load than it really is. MAP is used as the PCM's measure of engine load.