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Originally Posted by nowa
(Todd: ECM permanently removes 5d of spark advance when persist knock is detected)
norbert
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Norbert, where did you dig that up?
I must have said it in a previous thread. Anyway, that comment was in reference to Low Octane Knock retard, which is not what Dom is experiencing. His is the usual short-term high load knock event. This would not trigger the Low Octane activity.
Dom, the trigger for a Code 55 is a lean O2 reading during power enrichment. This means lean side of the "set-point" in the calibration. My theory is the 55 set, then the secondary injectors shut down (as they are supposed to). That put you into the PT closed VE & spark tables, which is obvious from the pulsewidth change after the code.
because the port throttle plates are gone, the airflow remained high. The O2 readings after the shift are absurdly low, indicating a real lean condition.
Best to get out the FSM and troubleshoot the 55, before tearing into the calibration.
Todd