Dynoed my truck this weekend while hooked up to EFI Live.

I have a 99 GMC with a 99 LS1 from a TA. Truck intake and truck computer. Stock internals.

Starting at approximately 70% throttle I am getting knock retard. It ends up pulling about 5 to 7 degrees of timing. Timing advance is only about 14 to 16 degrees.

We changed the timing advance using EFI Live and did another run. Same thing.

I have deleted torque management.

Question, do I use the knock sensor from the LS1 or the knock sensor from the truck. Does it really matter?

Any other suggestions?

Truck runs fine otherwise.

Thanks