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knocking or chattering
Mine does this and it drives me nuts!?! At around 1500 to 1800 rpm 25 to 45 mph in 4th, 5th or 6th. It is barely audible but I hear it. I always use premium and I have ran Zmax treatment without any change. It kind of sounds like the cylinders are knocking or pinging but as I said, it's very faint. I can hear it better with the windows up. Any suggestions other than what's already been posted?
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