IF YOU CONFIRM Spark knock and/or lack of power, and 91 AKI (Anti-Knock Index) number (Research octane number 96) is the highest octane fuel in your area. ACTION 1. Refer to step 6 in the SERVICE PROCEDURE of this bulletin to confirm this bulletin applies to the vehicle you are working on. 2. If this bulletin applies, reprogram the ECM. See this bulletin for further detail.
