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Message: <blockquote data-quote="FW_Z71Burb" data-source="post: 25785" data-attributes="member: 13704">WOW, thank you for this response on my engine knock / fuel octane topic and all the helpful information.. it's been the biggest source of heartburn since purchasing it. to expand on it, the code it threw was P0332. CEL light would come and go. on cold start, it will knock for about 4-5 seconds and go away.  I havent located the source of the knock. no other pinging or knocking once she's warm and drives great.  I was hoping to have the plugs and cylinders checked on the next oil change to see if there's anything that can be found.  I have no real maintenance history so don't know how old the plugs are, but judging by how the owner cared I have to assume they were changed at around 100k miles according to the maintenance schedule.</blockquote>