Predetonation/spark knock

[JLUTampa]

I've been having a recurring issue with what sounds like spark knock at lower RPMs. I've brought it to the dealer, and did a ride along with their senior tech on the issue, but because its intermittent, I had to more or less forcibly recreate the issue.

The speed limit from where I live to where I work is 20 mph with about 4-5 stop signs, and this seems to be where it happens most, always at lower RPMs. There will be a rattle in the motor for about 3-5 seconds on acceleration, and then it goes away. I can recreate the issue by pressing the gas, releasing the gas, and pressing it again. Now, I know that I'm recreating it because I'm confusing the computers VVT, but it's the only way I can reproduce the sound I'm hearing while the tech is with me.

It did not do this during the colder weather, and wont do it when the engine is cool, or even when its warm at first. After an hour or so of driving, though, it begins to do it.

I've fueled up at different stations owned by different companies, so im not convinced it's the fuel. I've also put 89 in instead of 87 with same results.

Has anyone else experienced this?

Did you get this fixed or find out the issue? Just had my JLU in today for the same exact problem and they couldn’t replicate it. Taking it back Monday AM. Please let me know if there is any update on this. Thanks in advance!

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