If nothing was repaired for this concern the most common concern is the knock sensor and wiring harness connectors rusting.they are located under the intake manifold assembly in the valley of the engine.
SOURCE: I can't find the location of the knock sensor on
Knock sensor replacement requires the removal of the intake manifold as the knock sensors are under it.
SOURCE: knock sensor on 2001 chevy silverado
on the 4.3l version the knock sensor is on the back left side of the engine right by the bell housing. on the bigger engines they are below the intake manifold in the engine valley
SOURCE: knock sensor location
The knock Sensors are located under the Intake Manifold at the top of your engine. The top will have to be taken off along with the intake manifold. Knock Sensors in past silverados used to have a problem with leaking water that corroded the sensors from washing the engine. Most times when you go to replace the knock sensor you will have to replace both along with the wiring harness that includes the the gaskets the knock sensors are surrounded by. After that you have to check the resistance to make sure you dont have any problems and then reinstall all parts along with a new intake manifold gasket. A good mechanic can do this for you in a day and charge you around $400. If you try to go to some place like a chevy dealer you will pay over $800. This is from experience of just replacing mine 2 weeks ago.
under the intake manifold on a 5.3,theres 2 of them
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