Spark Knock after Tune-up
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So I replaced the usual... plugs, wires, oil, fuel and air... I noticed today spark knock in the mid RPM range in 3rd. What causes this? I always thought this was from lugging the engine. Before the tune-up I noticed SOME spark knock, but it was only when i would floor it in 5th at around 1,000-1,500 RPM which i considered pretty low, so I understood why it was happening.