Answers: try a highly developed octane fuel.
Under heavy nouns the engine may suffer from pre-ignition and ignition misfires. Both may cause the knock sensor to initiate and the computer retards the engine timing to reduce the knock, but that causes a loss of engine power. Your engine have carbon buildup which needs cleaning. Some gasolines hold less additives and increase the carbon buildup. A better octane petrol would help the problem, but you shouldn't hold to use higher than your owner's brochure specifies. Try adding the products below to your fuel reservoir to clean out the carbon. Mechanical problems that can end in the spark knocking include an EGR spigot that isn't opening on acceleration, a impossible knock sensor and an engine that's running too hot. See the spark knock reference below.
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