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They are underneith the intake manifold. You can not see are get to them until you REMOVE the INTAKE manifold.
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Where is the knock sensor on a 2003 Chevy silverado 5.3?
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how do you change the knock sensor in a 2003 Chevy silverado 5.3
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I don't answer questions for free. I work for $108.88 per hour, and your time starts now.
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