Knock sensors plug test.
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You have two knock sensors on your engine, one in the front near the starter.
![](https://www.gmforum.com/howto/test-pics/PA150009.JPG)
And another near the rear of the engine, near the center between the cross member and oil pan.
![](https://www.gmforum.com/howto/test-pics/PA150013.JPG)
Unplug and check for corrosion or damage. Clean or repair if needed.
And another near the rear of the engine, near the center between the cross member and oil pan.
Unplug and check for corrosion or damage. Clean or repair if needed.
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