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Message: <blockquote data-quote="cepowers18" data-source="post: 408301" data-attributes="member: 10323">I put the "?" in the title b/c I have no idea if that's my issue or not, but here is what's happening...So I didn't adjust my timing myself (my mechanic did at least 6 months ago or more), but it is currently at 12 degrees. For awhile after he adjusted it, when at WOT I would hear sort of a slight ticking / scraping noise coming from the engine. At the time I was using 89 octane gas so I took this as a sign that 89 wasn't high enough. I switched to 93 octane and ran it for awhile and occasionally I would hear the noise but by and large it went away.Literally, just the other day I decided to try switching back to 89 again since gas prices are obviously high. At WOT with 89, I started hearing the noise again.Other than the obvious (switching back to 93) does anyone have an idea as to what may be going on... and/or can anyone explain why it's happening?Any help is much appreciated :TY:</blockquote>