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Originally Posted by deliriousga
The biggest performance killer with the lower octane fuels is the knock sensor. Its' job is to help save the engine from being damaged by knocking in the cylinders. The lower octane fuel is more volatile so it explodes too early from compression and not from the spark causing the knock. The knock sensor feels knocking occurring and the O2 sensor notices left over fuel going down the cats. The computer starts changing fuel/air mix, timing, etc. to make the fuel combust when the spark occurs and to make sure all of the fuel in the chamber is burned. That kills your performance because the engine was designed to run best with the higher octane fuel.
A lot of people hate the knock sensor because of the retarding of performance it can cause, but I love it.
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Can the knock sensor get damaged in any way? What happens when the knock sensor is damaged?