hi. I'm pretty new to prom burning but I'd like to ask a question. My knock sensor's been bypassed for the last couple of years or so with a resistor to ground ( I have my reasons). Lately I'm starting to see knock counts on Diacom and I can see and feel the timing being pulled back by the ECM. Even though I've pretty much zeroed out the knock tables in the bin for NO knock retard it still does it. My question is... is there a routine in the .bin that can by somehow bypassed for the ECM to completly ignore the knock sensor input ? Or a flag that could be set somehow ?
Thanx

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1991 Z28

 

Flags are different then not running a routine.
If your using an 8D mask try setting 020A and 020B, to FF. Being experimential in nature use the above at your own risk. Your already running sans sensor, which depending on your availibility of good gas can make this potentialy danagerous.

 

I can see how knock can still be detected, but if he sets the max retard to zero, how can he still be seeing retard? Is there logic that will retard the timing "regardless"?



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'87 IROC 5.7l TPI - original owner!

 

When you just 0 tables out, the code may run in a loop from that, still looking for a *factor*. You can get ALDL code to just run continually by 0'ing out something the ecm expects to see. On some of the O2less codes you can watch the BLs run 0 to 256 and repeat for every each correction taking a min or 5. Some code can be flat spooky to watch run.

That why I suggest to folks who are serious about actual code and tuning to make an ECM test bench.

http://www.diy-efi.org/gmecm/project...cm_tbench1.jpg

 

It looks like I had a bad ground. I bypassed t again with a 3.5K resistor this time and a new ground. I only see 2 knock counts when I first start the engine and it stays at 2. No more pulling back timing either. And yes I run good gas. I always run 100 octane in it It smells great and the car runs good too.

 

 

I've had very good luck "capping" the Max Knock Retard @ WOT (or while in PE). This allows me to control my knock incidences @ WOT, but retain the knock sensor for part throttle.

 

I cap mine at 30d.
Yep,
I've gotten a load of lousy gas several times, and I'd rather let the engine go way down on power then have any detonation.
Just my 1.326 cents worth