Spark Knock

[Leosegura155]

Alright so I got a 2019 Mustang GT 10spd and it’s tuned on 93. It had false knock then I fixed it and it was good but under load it’s only giving me 13* of timing when it’s suppose to be double of that per my tuner. But I started hearing this the other day and saw some videos on YouTube about spark knock and it sounds exactly the same. How do I fix this?

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[stanglife]

Is it cold at this point?

 

[Leosegura155]

Is it cold at this point?

Outside yes but I’d say 60s here in Texas. car was pretty warmed up oil temps where good and trans temp was above 150. I would get false knock on my previous exhaust set up so I changed the whole thing and it went away but then when under load doing a WOT I’m guessing it’s only giving me half of timing

 

[stanglife]

Sounds like piston slap. I've talked about it before but the term makes it sound worse than it might be. I've been ok with a very faint piston slap when cold but my preference is for it to almost completely disappear after oil temp is up to 180-200 (pistons expand). Try getting gas somewhere else, always top octane. Also get an oil analysis (black stone).

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