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Originally Posted by lynch mob
Really why don't you explain to the class how the PCM will know the difference between 87 octane and 91 or 93 octane?So what you are saying is the PCM will recognize a lower octane fuel and adjust the timing etc. based on the octane?I really would like to hear this answer.
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no I didnt say anything like that.I dont know how it works Im not a GM tech, But ive been told by plenty of them that it has a knock sensor, just like Dupinnst said. And it adjusts spark and fuel.
Ive never EVER had a problem running any octane. Unless I actually had a engine problem. Like when the EGR went bad on my truck. It would run a lot better with 91, and fuel injector cleaner or octane boost. until I put in a new one
Why dont you do a little story telling of your own? Im pretty sure you dont gain or lose HP by using the wrong octane of fuel