magnoman Posted May 9, 2005 Share Posted May 9, 2005 Hi, I have a 98 outback that recently started to hesitate and surge on accel and will just start pinging up hills on the highway. I have changed , wires, fuel filter, ing coil, spark plugs, used cylinder cleaner, injector cleaner. Both o2 senors & back cat. checked PCV & EGR valve and all Vac lines! Could this be the knock sensor and where would that be? Link to comment Share on other sites More sharing options...
Setright Posted May 9, 2005 Share Posted May 9, 2005 Knock sensor is on top the engine, between the driver side intake manifold tubes. Black, circular, with a bolt through the center. Search this site and I sure you will find lots of pictures. Link to comment Share on other sites More sharing options...
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