OK here is one for the programming gurus out there...how do you remove the "low octane" learning routine using LT1 Edit for OBDII?
I think I am in low octane mode because every time I start the car and go WOT I see 10.0-11.0 degrees of retard even though the knock count is not increasing. After 10-20 minutes of driving and a number of WOT blasts the knock retard slowly decays to zero. This decay takes much longer than normal knock retard. This leads me to think it is the low octane routine.

I've already set the "lo octane retard" field to zero (already was zero), and zeroed the "retard vs. MAP" table which only affects part throttle activity. The WOT problem seemed to get worse when I zeroed the "retard vs. MAP" table which I did to get rid of learned retard in part throttle.

Anyone understand how the "low octane" routine works? I searched a number of boards and this seems to be a topic nobody has figured out.

Thanks!

 

This thread may help: http://www.thirdgen.org/techbb2/show...threadid=39115

Although it is for our 7730 TPI ECM, the fields may be the same and may help you disable it.

 

IMHO the best thing to do with the knock retard function on a properly tuned and operated car is to disable it. It's designed for people who do dumb stuff like operate at high load/low rpm or put bad fuel in their cars. I fought with it for months and then finally disabled it two years ago. The problem I had was it was detecting (false) knock at tip in and the throttle response sucked as a consequence. What a difference after turning it off!

BTW: my pistons were in good shape after two years of boost + nitrous and no knock retard.

Rich Krause