Hello: The Knock Sensors purpose is to detect pre-ignition, when the computer receives a knock signal it re tarts the timing to prevent the pre-ignition. Any mechanical related knock will activate the knock sensor signal. If the knock sensor is bad it WILL NOT cause the engine to knock.......
So what would start making it knock out of the blue right up top where the lifters are when it never over heated
You may have a collapsed lifter making the noise. You can try changing the oil and filter and putting in a cleaning addative to see if that will make the noise go away. If its more than one lifter you could have low oil pressure.
Can I use some kerosene to clean the engine instead of that over the counter stuff that barely works or what's the best additive
I would NOT use kerosene. I really can't recommend any paticulre product. It would be best if you looked at the different products and the you make up your mind which one you like. Follow the directions.
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The cause of knocking, given that the engine is in good mechancial shape, is carbon buildup inside the cylinders, worn or improper spark plugs, and "bad" gas. Higher octane fuels retard the rate of explosion. Low octane fuels are faster-burning and more prone to igniting from a glowing carbon ember or a spark plug prong that is overheating. The engine computer uses the knock sensor (a microphone) to listen to the explosions inside the engine to determine if they are occuring when expected. When they are not, the computer retards the spark timing to help prevent "pre-ignition."
Sever cases of "pinging" (a.k.a "detonation") will greatly increase cylinder temperatures enough to melt holes in pistons and let aluminum cyclinder head surfaces! Been there. Done that!
Important: The larger metal contact area of the knock sensor MUST be toward the engine block. DTC P0327 may result if the sensor is installed backwards.
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