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Where is my knock sensor ?

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Its bolted to the deck of the short motor. Gambit is thinking of the right area. It's almost directly under the idle control valve. You may see the wire/plug easier than the actual sensor. It's usually a single black wire with a white plug. You will definitely need to take the top mount off to change it.

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Could be a number of things but usually just running rough. Sensor usually cracks and the crack opens when warm and closes when cold so until it's up to temp, everything can sometimes appear normal. Even when hot, the gap can close and give periods of normal running.

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