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2003 GMC Sierra 1500 Question: knock sensor



, 4.8L V8, Austin, TX, September 19, 2010, 13:29

Where is the knock sensor located, and is there more than 1?

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  • Answer #1

    daveer (see my shops), October 06, 2010, 09:31

    There is only one sensor. Located on the left rear top of engine block. Held on by a single bolt that goes through the middle of it.

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  • Medium-star Best Answer
    Visitor, November 13, 2010, 19:59

    I have a 1999 4.8 vortec. There are two knock sensors under the intake manifold that are screwed into the lifter valley. The wires come out from under the rear of the intake manifold and connect the main wiring harness was at the rear of the intake manifold. Before you start taking off the intake check the wiring.

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