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It is underneath the intake manifold. If you look straight down from the throttle body, you will see a sensor with one wire coming out and a bolt going through the middle of it, that is the knock sensor.
Open the hood, and disconnect the battery negative cable with a wrench.
Locate the black rubber air intake tube that runs from the air cleaner box to the throttle body on top of the engine.
Loosen the clamp on the air intake tube at the throttle body with a wrench. Grasp the tube and pull it off the throttle body inlet, and move it out of the way.
Locate the knock sensor. It's bolted to the engine near the throttle body. Remove the hold-down bolt attaching the knock sensor to the engine block, using a 3/8-inch drive ratchet wrench with a 12 mm socket attached.
Follow the electrical lead of the knock sensor to its connector, and simultaneously lift the plastic tab with your hand while gently pulling apart the plug.
Remove the knock sensor from the engine bay. Compare the old sensor to your new part to ensure they are identical.
Reattach the knock sensor to the engine block by threading in the original holding bolt by hand. Snug the bolt with the ratchet wrench and 12 mm socket. Do not over-tighten the bolt.
Plug the new knock sensor into the original electrical plug.
Gently push the throttle body air intake tube onto the throttle body. Tighten the hose clamp with a wrench.
Reconnect the battery's negative terminal with a wrench. Close the hood.
Start your Subaru's engine. Take the car on a test-drive and verify that the spark knock has disappeared.
Sounds more like you have a bad fuel pump.If you have a pressure tester then check the fuel pressure.You need top have between 41-47 psi fuel pressure.
Sounds like the pipe/connection from the exhaust manifold to the EGR valve that is located at or near the throttle body has a leak. That would make a loud popping noise.
Sounds like knock sensor is shot. I believe on that engine it is down to the right of throttle body intake. Kind of hard to get at, but can be done with a little patience.
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