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the knock sensor is in the block under the manifold if its a v6 it is under the manifold between the cyl heads may have to take intake manifold off to find it
Just ahead of the starter the knock senser just screws into the side of the block. The problem is it screws into the engine coolant and the coolantr will come out then you remove the old senser. even if you frain the raditor coolant will still be in the engine ( quite alot) and you'll need to catchir in some way. You can get about 2 gallons. The messly way to do it is to ( with the engine cold) loosen the senser till you can turn it by hand. With the new senser in th=your other hand remove the senser and quickly screw the new senser in. You'll almost certainly get coolant on you so be eady, covering your eyes and arms ( glasses and a raincoat) you do it quickly eniugh very little mess will be made. The plug just squeezes and pulls off. Knock sensers seldom fail but the connection and the wires do. Someone replaceing the startercan hit the senser and break it. Don't drop the senser as the fall can break it too.
Sounds like you missed connecting something back up. The Knock senser won't make it not run it'll just not let it run at peak power. The OHMs on the sensers just need to be close and your old senser may be just fine. The senser watches a reluctor wheel go by. Did you put it back on? did you put it right side up? It'll fit backwards but it won't line up with the senser.
I would try and replace the knock sensor. If the sensor reads a knock or any movement it shouldn't be doing the car will shut off right then and there and then you have to wait a while for it to start again.
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