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I have a question. I uploaded the 93 octane tune on my car while having 87 octane in the tank with thoughts of taking it easy until the other quarter of a tank burnt off so i could put in the 93. Well I did this and everything is fine I just heard some spark knock while shifting. anyway can this be harmful at all ? running 93 tune on a tank of 87?
VERY harmful.... load the 87 tune back in now! seriously, everything you will read on this board says this is a major no no.