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Re: outback wagon no power going up hills.
What's the check engine light code? You need to get the code(s) read using a code reader and then we can help. A place like AutoZone will read the code for free and then you can look it up at http://www.obd-codes.com/trouble_codes/
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did you have the check engine light reset after replacing it? if not then go to auto zone, and let them know you replaced it and need to reset the trouble light for the check engine light... hope this helps...
The knock sensor is most likely ok you need to do a top engine clean to get the combustion chamber presure down so the knock sensor can ****** the timing enough to not knock or ping, You may not here the ping but the knock sensor does. Go to a GM dealer and buy a can of top engine cleaner warm the engine up and pull vacuum line off the back of the throttle body and allow it to **** the full bottle into the engine then kill the engine. let sit for 20 minutes hook up vacuum hose start the engine and rev it up to where it will still run let it run for 10 minutes till smoke clears out then take it for a test drive after you drive it 10 or 15 miles you should notice the check engine light not cumming on and the engine ill run smoother and the fuel millage will go back up, afterwords change the motor oil and filter to get rid of all the carbon down in the oil pan. If this does not fix it then change the knock sensor, it has 4 wires running to it and is on the side of the block left side. If you replace it be sure not to tighten it to tight if fact use a tork wrench to tighten it or you will break the ceramic disc inside the sensor.
it could be that the wiring to or from the knock sensor has a prob. also after the knock sensor was changed was the code cleared? if it was not it may be a inactive code that stays in the computer causing the light to stay on...
Check for vacuum leaks. ie, vacuum lines them selves, the rubber tube that runs from the air filter to the throttle body. If it has a plastic intake manifold, possibly the rubber port seal gaskets between it and the engine. Lean codes are set when the PCM isn't monitoring all the air coming into the engine (vac leak) or low fuel pressure.
if there is a knocking sound the computer will start retarding the timing to get rid of engine knock thru the knock sensor. Make sure you are using the correct grade of fuel. it will be listed in your owners manual. the improper grade of fuel can cause detonation in your engine. giving a knocking sound. if the change in fuel doesn't help you may be looking at mechanical repairs. hope this helps. mike