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I've been looking at some tunes on holdencrazy.com, and they started putting the O2 switch points at 450mv across the board starting in 2003 for the LM7 engine.
That seems like the best route to go....

Why does GM have the O2 switch points set so high in their tunes?
This is the factory switch points.

LABELS bank
CL Mode Bank-1 Bank-2
0 480.022245 480.022245
8 480.022245 480.022245...

Could you copy with labels from your tune, and then paste in a message what you have yours set at?
Sorry, I didn't see who sent the message. I thought you were cmitchell17?

I have a 1999 5.3 ext. cab, and I lowered my O2 switch points to:

CL Mode Bank-1 Bank-2
0 460.015667 460.015667
8 460.015667 460.015667
16 460.015667 460.015667...

joecar, you seem to be very knowledgeable in tuning.

Does this look like Burst knock to you?

I seem to get alot of spikes like this.

http://img511.imageshack.us/img511/9248/image3ha2.jpg

No I live in USA, but the truck was made in Canada and sold in the USA. I'm trying to post the pics, but having trouble with that.

Hello to all.
I am new to this forum and EFILive tuning.

I have a 1999 Chevy Silverado that was manufactured in Canada.
When I compare the High/Low Spark octane table from one that was...