Originally posted by JeepsAndGuns
YES, if the computer is getting a "knock" signal, it will retard the timing.
I have bypassed my spark control by providing the 5V reference signal to the knock sensor input on the ECM. (Bin B7 on the '7747 ECM)
You could try to zero out the knock retard tables in the bin and if that makes a difference, you've found your problem.
Does the ECM log spark counts BEFORE it gets into Closed Loop mode? If so, see if there are any spark counts in the table via WinALDL.
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