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pinging / hesitation

magnoman
in 1990 to Present Legacy, Impreza, Outback, Forester, Baja, WRX&WrxSTI, SVX

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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?

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.

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