Engine knock comes in many forms — bearing knock, diesel knock, piston slap, and several others. But today, I want to highlight a rare and often overlooked type of engine knock that many technicians struggle to identify. This knock hides behind normal engine noise, and if you don’t understand its signature, you can chase the wrong fault for days. It doesn’t sound like a bearing, it doesn’t behave like timing knock, and it doesn’t follow the usual rhythm of a failing piston. This is the kind of k
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