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Originally Posted by awrj2000

I think what your hearing is LSPI (Low Speed Pre-Ignition).

That is just a fancy new term for knock with modern engines.

If you start reading into it (LSPI) you will find studies show some oils are more prone to allow knock events.

So...maybe an oil change to something of higher quality?

Other than looking into that direction...I can't offer any other help on your issue.

Any oil meeting Dexos 1 Gen 2 is the best you can get for "LSPI type oils".

Could be hearing the injectors and thinking it's knock?