Thanks much for the response. Quite likely TP may be displaying the wrong value. Where are the max advance and max retard values located in TP5? Are these in the scalars or elsewhere? The KS has been replaced by resistors of the appropriate value to satisfy ECU test, open wire, short or defective KS sensor. Knock reduction parameter(s) should not be affected. Need recommendation of appropriate TP definition file for 1995 Chev C-1500 TBI 350 V8 16197427 ECM being converted to 350 Vortec with 454 Throttle body. Hope the one being used is what it should be. Need to try another ECM to see if there is more appropriate timing correlation. Two good possibilities for current situation.
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