(5.3L V8) The Intake manifold needs to come off don't worry intake gaskets are reusable if you don't tear them. The will be 2 black plugs right in the the middle of the valve train. Knock sensors are under them. Best if you replace the wire harness going to them too. Found out by a GM Technician that's mandatory to replace the harness because of possible break in the connection to the both sensors.
I found in a google search 15ftlbs torque for the knock sensor.
There are two knock sensors on a 2004 2500HD V8 6.0 Chevy Silverado. Both of the sensors are mounted under the intake manifold on the engine.
you have to pull off the intake they are under there. you have two you might as well replace both
There is 2 of them on that engine. And they both are underneith the intake manifold. You will have to remove the intake to even see are get to them. NO OTHER WAY.
behind the starter
We need to know what engine you have to answer that.
There are 2 knock sensors on that engine. Both of them are underneith the intake manifold. You must remove the intake to even see them and to service them.
There are 2 of them on that engine and there underneith the intake manifold. You can not see are get to them until you remove the intake.
under the intake manifold
What color is the mute wire for 2004 chevy silverado?
Working on the SRS can be very hazardous. For this reason I suggest you have this repaired by a professional.
It is behind the starter. You can not see it are get to it untill you remove the starter.