Been on new gas for a couple days and no change. I'm also pretty sure it's real knock because when the engine is still pretty cool it won't do it. So, something is heating up in there and causing knock.

I've got nearly 68k miles on the factory iridium plugs and I think they're causing knock. New plugs are on the way, and PRJ wires will meet me back home later this week. Tuesday I'm changing my O2 sensor.

So, I'll see what happens. I've successfully eliminated gas as the issue, though I'd hate to see how bad it is with 87 instead of the 91/93 I have been using...

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2004 Impala LS - got some mods
NAIOA Moderator

Making you think twice before picking on Impalas