How can I tell if I'm getting enough knock that it retards timing? It's the 160 baud ecm and the knock sensor reading is never 0, it's always around 5. What exactly is this value? I can't find a good description through my sources. Does this value go up and down or only up? What is the safe value before the engine retards timing?
Thanks in advance.

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, Jon (350 TBI!)
91 Red My website

 

Jprevost,

The "Knock Count" in Diacom is exactly that...A knock "count".

Diacom is simply counting each reference pulse from your knock sensor, and adding it up to the sum that you see on the Diacom screen. This count only goes up, and can only be cleared by re-initiating your link to the ECM. If you Have Diacom Plus, run a graph of your knock counts, RPM and your timing, and you will see exactly where timing is being pulled. If you just have regular Diacom, simply pan through your frames with the arrow key until you see where the knock is coming into play. I can almost guarantee that you are getting those five knock counts on initial start-up, which is very common and not a problem. Five knock counts at start-up is nothing to worry about.

The amount of timing actually being pulled out is all dependant on your Knock Attack Rate....X number of milliseconds of knock, pulls out X amount of timing at a given PRM....I believe that's how it works anyway. Someone correct me if i'm wrong on the actual formula.



[This message has been edited by Steves ZZ5 (edited July 11, 2001).]