SUBARU KNOCK SENSOR REPLACEMENT now backfiring

SOURCE: 98 subaru impreza knock sensor

at the top of the block under the plenum runners.
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SOURCE: 92 subaru wagon

Subaru Legacy Wagon, is possible to fix the suspension compressor?

SOURCE: Replacing the knock sensor in a 2002 subaru forester.....

Disconnect the negative battery cable first. Better to be safe in case something arcs.

SOURCE: Where is the knock sensor located on a 2.5 Subaru outback 1998?

directly below the throttle body on the drivers side of the engine block. Has a white connector attached to a single black wire lead. I had to remove the black plastic piece that connects to the throttle body and the air filter housing, in order to see/get at it. Easy fix once you find it. Haynes manual shows it in a different location, so don't confuse yourself looking at the diagram.

SOURCE: My 2002 Subaru Legacy runs rough thru quick

If it is backfireing, then it is in the timeing ,your timeing belt may need to be replaced. How many miles does it have on it ?